Mailing Envelopes

Paper and Tyvek mailing envelopes by the case, from 2.25 x 3.5 in to 24 x 36 in: kraft and white flat envelopes, clasp, Tyvek, expandable, jumbo and inter-department. Each row shows envelopes per case, the case price, the price per envelope and stock, with a button to add one case.

Kraft and white 28 lb paper envelopes
Size	Color and closure	Envelopes per case	Price per case	Price per envelope	Stock
6 x 9 in	Kraft, gummed flap	2,500	$430.20	17.2¢	In stock
6 x 9 in	Kraft, self-seal strip	500	$98.80	19.8¢	In stock
6 x 9 in	White, Redi-Seal	1,000	$360.32	36.0¢	In stock
6 x 9 in	White, self-seal strip	500	$93.60	18.7¢	In stock
6.5 x 9.5 in	Kraft, gummed flap	2,500	$439.62	17.6¢	In stock
6.5 x 9.5 in	White, Redi-Seal	1,000	$371.58	37.2¢	In stock
7.5 x 10.5 in	Kraft, Redi-Seal	1,000	$328.21	32.8¢	In stock
9 x 12 in	Kraft, gummed flap	1,000	$231.66	23.2¢	In stock
9 x 12 in	Kraft, self-seal strip	500	$124.54	24.9¢	In stock
9 x 12 in	White, Redi-Seal	500	$197.60	39.5¢	In stock
9.5 x 12.5 in	Kraft, gummed flap	500	$142.91	28.6¢	In stock
9.5 x 12.5 in	Kraft, Redi-Seal	500	$198.80	39.8¢	In stock
9.5 x 12.5 in	White, self-seal strip	500	$133.90	26.8¢	In stock
10 x 13 in	Kraft, self-seal strip	500	$208.75	41.8¢	In stock
10 x 15 in	Kraft, Redi-Seal	250	$167.28	66.9¢	In stock
11.5 x 14.5 in	Kraft, gummed flap	250	$120.55	48.2¢	In stock
12 x 15.5 in	Kraft, gummed flap	250	$109.23	43.7¢	In stock
12 x 15.5 in	Kraft, Redi-Seal	500	$342.55	68.5¢	In stock
12 x 15.5 in	White, self-seal strip	500	$197.60	39.5¢	In stock

28 lb kraft clasp envelopes, metal clasp with gummed flap
Size	Envelopes per case	Price per case	Price per envelope	Stock
4 x 6.375 in	1,000	$387.61	38.8¢	In stock
6.5 x 9.5 in	1,000	$246.13	24.6¢	In stock
9 x 12 in	500	$127.50	25.5¢	In stock
9.25 x 14.5 in	500	$260.47	52.1¢	In stock
9.5 x 12.5 in	500	$164.45	32.9¢	In stock
10 x 12 in	500	$211.42	42.3¢	In stock
10 x 13 in	500	$152.43	30.5¢	In stock
10 x 15 in	500	$204.97	41.0¢	In stock
11.5 x 14.5 in	500	$235.95	47.2¢	In stock
12 x 15.5 in	500	$230.20	46.0¢	In stock

14 lb Tyvek envelopes, flat, self-seal
Size	Color or print	Envelopes per case	Price per case	Price per envelope	Stock
6 x 9 in	White	100	$42.86	42.9¢	In stock
7.5 x 10.5 in	White	100	$50.34	50.3¢	In stock
9 x 12 in	White	100	$54.44	54.4¢	In stock
9 x 12 in	White, First Class print	100	$56.76	56.8¢	In stock
9 x 12 in	White, tamper evident	100	$116.48	$1.16	In stock
9 x 12 in	Black	100	$135.53	$1.36	In stock
9 x 12 in	Green	100	$135.53	$1.36	In stock
9 x 12 in	Red	100	$135.53	$1.36	In stock
9 x 12 in	Silver	100	$135.53	$1.36	In stock
9 x 12 in	Yellow	100	$135.53	$1.36	In stock
9.5 x 12.5 in	White	100	$60.23	60.2¢	In stock
10 x 13 in	White	100	$56.02	56.0¢	In stock
10 x 13 in	White, First Class print	100	$62.54	62.5¢	In stock
10 x 13 in	White, tamper evident	100	$122.08	$1.22	In stock
10 x 13 in	Black	100	$142.47	$1.42	In stock
10 x 13 in	Green	100	$142.47	$1.42	In stock
10 x 13 in	Red	100	$142.47	$1.42	In stock
10 x 13 in	Silver	100	$142.47	$1.42	In stock
10 x 13 in	Yellow	100	$142.47	$1.42	In stock
10 x 15 in	White	100	$72.97	73.0¢	In stock
12 x 15.5 in	White	100	$79.30	79.3¢	In stock
12 x 15.5 in	Black	100	$178.37	$1.78	In stock
12 x 15.5 in	Green	100	$178.37	$1.78	In stock
12 x 15.5 in	Red	100	$178.37	$1.78	In stock
12 x 15.5 in	Silver	100	$178.37	$1.78	In stock
12 x 15.5 in	Yellow	100	$178.37	$1.78	In stock
13 x 19 in	White	100	$163.05	$1.63	In stock
15 x 20 in	White	100	$254.64	$2.55	In stock

Expandable envelopes with a gusset, self-seal
Size with expansion	Material	Envelopes per case	Price per case	Price per envelope	Stock
5 x 11 x 2 in	Kraft, 40 lb paper	100	$64.10	64.1¢	In stock
9 x 12 x 2 in	Kraft, 40 lb paper	250	$201.31	80.5¢	In stock
9 x 12 x 2 in	White Tyvek, 18 lb	100	$122.41	$1.22	In stock
9.5 x 13 x 2 in	Kraft, 40 lb paper	250	$210.94	84.4¢	In stock
10 x 12 x 2 in	Kraft, 40 lb paper	100	$94.16	94.2¢	In stock
10 x 13 x 1.5 in	White Tyvek, 18 lb	100	$115.01	$1.15	In stock
10 x 13 x 1.5 in	White Tyvek, First Class print	100	$125.78	$1.26	In stock
10 x 13 x 2 in	Kraft, 40 lb paper	100	$96.20	96.2¢	In stock
10 x 13 x 2 in	White Tyvek, 18 lb	100	$136.24	$1.36	In stock
10 x 15 x 2 in	White Tyvek, 18 lb	100	$153.58	$1.54	In stock
12 x 15 x 3 in	Kraft, 40 lb paper	250	$314.04	$1.26	In stock
12 x 16 x 2 in	White Tyvek, 18 lb	100	$172.54	$1.73	In stock
12 x 16 x 2 in	White Tyvek, First Class print	100	$187.12	$1.87	In stock
12 x 16 x 4 in	White Tyvek, 18 lb	50	$126.59	$2.53	In stock

28 lb jumbo envelopes, ungummed flap
Size	Color	Envelopes per case	Price per case	Price per envelope	Stock
12.5 x 18.5 in	Kraft	100	$50.79	50.8¢	In stock
12.5 x 18.5 in	White	250	$137.80	55.1¢	In stock
14 x 18 in	Kraft	100	$58.28	58.3¢	In stock
15 x 20 in	Kraft	100	$67.18	67.2¢	In stock
15 x 20 in	White	250	$173.71	69.5¢	In stock
16 x 20 in	Kraft	100	$72.86	72.9¢	In stock
17 x 22 in	Kraft	100	$71.54	71.5¢	In stock
17 x 22 in	White	250	$209.30	83.7¢	In stock
18 x 23 in	Kraft	100	$90.78	90.8¢	In stock
22 x 27 in	Kraft	100	$109.20	$1.09	In stock
22 x 27 in	White	100	$125.45	$1.25	In stock
24 x 36 in	Kraft	100	$257.83	$2.58	In stock

Small kraft, #10 business and inter-department envelopes
Size	Type	Envelopes per case	Price per case	Price per envelope	Stock
2.25 x 3.5 in	Kraft, gummed flap	5,000	$356.63	7.1¢	In stock
2.5 x 4.25 in	Kraft, gummed flap	5,000	$377.00	7.5¢	In stock
3.125 x 5.5 in	Kraft, gummed flap	5,000	$509.38	10.2¢	In stock
3.375 x 6 in	Kraft, gummed flap	5,000	$592.80	11.9¢	In stock
3.5 x 6.5 in	Kraft, gummed flap	5,000	$673.62	13.5¢	In stock
4.125 x 9.5 in	#10 window, security tint, Redi-Seal	2,500	$407.94	16.3¢	In stock
10 x 13 in	Kraft, string and button	100	$56.52	56.5¢	In stock
10 x 13 in	Red, string and button	100	$110.54	$1.11	In stock
10 x 13 in	Yellow, string and button	100	$110.71	$1.11	In stock
10 x 13 in	Blue, string and button	100	$110.56	$1.11	In stock
10 x 15 in	Kraft, string and button	100	$91.48	91.5¢	In stock

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IN STOCK

Heavily gummed 9x6 kraft envelopes deliver a reliably secure seal for your mailroom operations. Made from strong 28 lb. paper stock with opaque construction to protect contents from view. Ships as a case of 2,500 units–the cost-efficient choice for high-volume mailers.

Envelopes & Mailers

9x6 28 lb Kraft Gummed Envelopes 2500/Case

PN: EN1020

9 x 6 in 28 lb. Paper Stock 2500 PER CASE

$430.20 / CASE

IN STOCK

Speed up your mailroom with our 6x9" kraft self-seal envelopes–no moisture or equipment needed. Simply peel, seal, and ship. Constructed from durable 28 lb. paper stock with a dust-resistant tear strip for reliable shelf life. Sold by the case of 500 for maximum efficiency.

Envelopes & Mailers

6x9 28 lb Kraft Self-Seal Envelopes 500/Case

PN: EN1068

6 x 9 in 28 lb. Paper Stock 500 PER CASE

$98.80 / CASE

IN STOCK

Speed up mailroom operations with Redi-Seal self-seal envelopes that require zero moisture–just fold, press, and seal. These durable 9" x 6" business mailers are made from premium 28 lb. paper stock and sold in cases of 1000 for reliable bulk mailing and shipping compliance.

Envelopes & Mailers

6x9 28 lb White Redi-Seal Envelopes 1000/Case

PN: EN1046

6 x 9 in 28 lb. Paper Stock 1000 PER CASE

$360.32 / CASE

IN STOCK

Eliminate sealing delays with our 6x9" white self-seal envelopes–no moisture, no mess, no hassle. Built from durable 28 lb. paper stock and sold by the case (500 envelopes). Peel-and-seal design keeps adhesive protected until you're ready to mail.

Envelopes & Mailers

6x9 28 lb White Self-Seal Envelopes 500/Case

PN: EN1069

6 x 9 in 28 lb. Paper Stock 500 PER CASE

$93.60 / CASE

IN STOCK

Professional-grade kraft gummed envelopes in 9.5" x 6.5" size with heavy-duty gummed flaps for secure sealing. Made from durable 28 lb. paper stock with opaque construction to protect contents. Bulk case of 2500 units reduces per-unit costs for high-volume mailroom operations.

Envelopes & Mailers

9.5x6.5 28 lb Kraft Gummed Envelopes 2500/Case

PN: EN1034

9 1/2 x 6.5 in 28 lb. Paper Stock 2500 PER CASE

$439.62 / CASE

IN STOCK

Save mailroom time with our 6.5" x 9.5" white Redi-Seal envelopes–no moisture required. Simply fold, press, and mail. Durable 28 lb. paper stock handles professional correspondence and shipping with ease. Sold by the case of 1000.

Envelopes & Mailers

6.5x9.5 28 lb White Redi-Seal Envelopes 1000/Case

PN: EN1056

6 1/2 x 9 1/2 in 28 lb. Paper Stock 1000 PER CASE

$371.58 / CASE

IN STOCK

Speed up mail preparation with these durable 7.5x10.5" Kraft Redi-Seal envelopes–no moisture needed, just press and seal. Constructed from heavy-duty 28 lb. paper stock, they deliver reliable protection for business mailings. Case of 1000 ready to ship.

Envelopes & Mailers

7.5x10.5 28 lb Kraft Redi-Seal Envelopes 1000/Case

PN: EN1050

7 1/2 x 10 1/2 in 28 lb. Paper Stock 1000 PER CASE

$328.21 / CASE

IN STOCK

Professional-grade 9x12" kraft gummed envelopes engineered for mailroom efficiency and shipping compliance. Heavy gummed flaps deliver a permanent, tamper-evident seal on 28 lb. paper stock. Order by the case (1,000 units) for maximum cost savings.

Envelopes & Mailers

9x12 28 lb Kraft Gummed Envelopes 1000/Case

PN: EN1022

9 x 12 in 28 lb. Paper Stock 1000 PER CASE

$231.66 / CASE

IN STOCK

Eliminate sealing delays with no-moisture self-seal technology. These 9x12 kraft envelopes feature durable 28lb paper stock with protected adhesive strip for consistent, dust-free performance. Sealed in cases of 500 for bulk mailroom efficiency.

Envelopes & Mailers

9x12 28 lb Kraft Self-Seal Envelopes 500/Case

PN: EN1033

9 x 12 in 28 lb. Paper Stock 500 PER CASE

$124.54 / CASE

IN STOCK

Eliminate moisture sealing delays with 9x12" Redi-Seal envelopes–simply fold, press, and mail. Built from durable 28 lb. paper stock for professional mailroom and shipping operations. Sold in convenient cases of 500 envelopes for cost-effective bulk mail preparation.

Envelopes & Mailers

9x12 28 lb White Redi-Seal Envelopes 500/Case

PN: EN1047

9 x 12 in 28 lb. Paper Stock 500 PER CASE

$197.60 / CASE

IN STOCK

Heavy-duty 9.5x12.5" kraft gummed envelopes deliver professional mailing with reliable seal and content privacy. Constructed from durable 28 lb. paper stock for protection without excess weight. Sold in convenient cases of 500 for cost-efficient bulk ordering.

Envelopes & Mailers

9.5x12.5 28 lb Kraft Gummed Envelopes 500/Case

PN: EN1035

9 1/2 x 12 1/2 in 28 lb. Paper Stock 500 PER CASE

$142.91 / CASE

IN STOCK

Eliminate sealing delays with Kraft Redi-Seal envelopes that require zero moisture–just fold, press, and ship. These durable 28 lb. paper stock envelopes measure 9.5" x 12.5" and come in a case of 500, making them ideal for high-volume mailrooms and shipping operations.

Envelopes & Mailers

9.5x12.5 Kraft Redi-Seal Envelopes 500/Case

PN: EN1043

9 1/2 x 12 1/2 in 28 lb. Paper Stock 500 PER CASE

$198.80 / CASE

IN STOCK

Speed up your mailroom with these 9.5x12.5" self-seal envelopes–no moisture required, just peel and seal. Constructed from durable 28lb paper stock with a protective tear strip that keeps adhesive dust-free for extended shelf life. Case of 500 delivers reliable, cost-effective mailing solutions for high-volume operations.

Envelopes & Mailers

9.5x12.5 28 lb White Self-Seal Envelopes 500/Case

PN: EN1070

9 1/2 x 12 1/2 in 28 lb. Paper Stock 500 PER CASE

$133.90 / CASE

IN STOCK

Speed up your mailroom with these 10 x 13" kraft self-seal envelopes that require zero moisture–just peel and seal. Built from 28 lb. durable paper stock and sold in a case of 500 units, these redi-strip mailers eliminate sealing delays and keep adhesive protected from dust for longer shelf life.

Envelopes & Mailers

10x13 Kraft Self-Seal Envelopes 500/Case

PN: EN1061

10 x 13 in 28 lb. Paper Stock 500 PER CASE

$208.75 / CASE

IN STOCK

Cut mailroom prep time with 15x10 Kraft Redi-Seal envelopes–no water needed, just fold, press, and mail. Constructed from durable 28 lb. paper stock to withstand shipping. Sold by the case: 250 envelopes per order.

Envelopes & Mailers

15x10 28 lb Kraft Redi-Seal Envelopes 250/Case

PN: EN1054

15 x 10 in 28 lb. Paper Stock 250 PER CASE

$167.28 / CASE

IN STOCK

11.5 x 14.5" Kraft Gummed Envelopes 28lb - Secure Seal, Case of 250

Envelopes & Mailers

11.5x14.5 28 lb Kraft Gummed Envelopes 250/Case

PN: EN1012

11 1/2 x 14 1/2 in 28 lb. Paper Stock 250 PER CASE

$120.55 / CASE

IN STOCK

Professional-grade 15.5" x 12" kraft gummed envelopes with heavily gummed flaps for a tamper-evident, secure seal every time. Made from durable 28 lb. paper stock with opaque finish to protect contents. Sold in bulk case of 250–ideal for high-volume mailroom operations and shipping compliance.

Envelopes & Mailers

15.5x12 28 lb Kraft Gummed Envelopes 250/Case

PN: EN1024

15 1/2 x 12 in 28 lb. Paper Stock 250 PER CASE

$109.23 / CASE

IN STOCK

Speed up mailroom operations with these self-seal kraft envelopes that require no moisture or adhesive tape. Constructed from durable 28 lb. paper stock, these 12 x 15.5" redi-seal envelopes deliver reliable shipping compliance and cost-effective bulk mailing solutions in cases of 500.

Envelopes & Mailers

12x15.5 28 lb Kraft Redi-Seal Envelopes 500/Case

PN: EN1045

12 x 15 1/2 in 28 lb. Paper Stock 500 PER CASE

$342.55 / CASE

IN STOCK

Eliminate moisture-sealing delays with these white self-seal envelopes. Simply peel and seal in seconds with durable 28 lb. paper construction. Perfect for high-volume mailrooms–500 envelopes per case ensure consistent, professional shipping compliance.

Envelopes & Mailers

15.5x12 28 lb White Self-Seal Envelopes 500/Case

PN: EN1071

15 1/2 x 12 in 28 lb. Paper Stock 500 PER CASE

$197.60 / CASE

IN STOCK

Heavy-duty 28 lb. woven kraft clasp envelopes with reinforced metal clasps for maximum reusability and cost savings. Secure gummed flap design ensures permanent seals for shipping compliance. Bulk case of 1,000 units sized 6 3/8" x 4" for mailroom and office packaging needs.

Envelopes & Mailers

6 3/8 x 4 in 28 lb Kraft Clasp Envelopes Reusable 1000/Case

PN: EN1014

6 3/8 x 4 in 28 lb. Woven Paper 1000 PER CASE

$387.61 / CASE

IN STOCK

Heavy-duty 28 lb. woven kraft clasp envelopes sized 9.5 x 6.5" with reinforced metal clasps for secure, reusable storage and shipping. Gummed flap creates a permanent seal when moistened. Buy by the case (1000 count) and reduce per-unit costs for your mailroom or shipping department.

Envelopes & Mailers

9.5x6.5 28 lb Kraft Clasp Envelopes 1000/Case

PN: EN1002

9 1/2 x 6.5 in 28 lb. Woven Paper 1000 PER CASE

$246.13 / CASE

IN STOCK

Heavy-duty 9x12" kraft clasp envelopes built from 28 lb. woven paper for maximum durability and reusability. Reinforced metal clasps and gummed flap provide a secure, permanent seal every time. Order a case of 500 and reduce your office envelope costs without compromising on strength or reliability.

Envelopes & Mailers

9x12 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1004

9 x 12 in 28 lb. Woven Paper 500 PER CASE

$127.50 / CASE

IN STOCK

Heavy-duty 28 lb. woven kraft clasp envelopes built for repeated use and secure sealing. Reinforced metal clasps withstand rough handling and multiple ship cycles. Dimensions 9.25" x 14.5", sold by the case (500 count)–the economical choice for high-volume mailrooms and industrial shipping.

Envelopes & Mailers

9.25x14.5 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1018

9 1/4 x 14 1/2 in 28 lb. Woven Paper 500 PER CASE

$260.47 / CASE

IN STOCK

These durable 9.5x12.5" kraft clasp envelopes feature reinforced metal clasps and a secure gummed flap for permanent sealing and multiple reuses. Made from sturdy 28 lb. woven paper to withstand frequent handling and shipping. Get 500 envelopes per case–the cost-effective solution for mailrooms and industrial operations.

Envelopes & Mailers

9 1/2 x 12 1/2" Kraft Clasp Envelopes Case of 500.

PN: EN1005

9 1/2 x 12 1/2 in 28 lb. Woven Paper 500 PER CASE

$164.45 / CASE

IN STOCK

Heavy-duty 12x10 kraft clasp envelopes built for reuse and durability. Reinforced metal clasps and secure gummed flap ensure documents stay protected during shipping. Each case includes 500 envelopes of 28 lb. woven kraft paper–the cost-effective solution for high-volume mailroom operations.

Envelopes & Mailers

12x10 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1019

12 x 10 in 28 lb. Woven Paper 500 PER CASE

$211.42 / CASE

IN STOCK

10x13" 28 lb. Kraft Clasp Envelopes - Reusable Security Seals, Case of 500

Envelopes & Mailers

10x13 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1006

10 x 13 in 28 lb. Woven Paper 500 PER CASE

$152.43 / CASE

IN STOCK

10x15" Kraft Clasp Envelopes 28lb Woven Paper - Reusable, Case of 500

Envelopes & Mailers

10x15 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1007

10 x 15 in 28 lb. Woven Paper 500 PER CASE

$204.97 / CASE

IN STOCK

11.5 x 14.5" 28 lb. Kraft Clasp Envelopes - Reusable, Case of 500

Envelopes & Mailers

11.5x14.5 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1008

11 1/2 x 14 1/2 in 28 lb. Woven Paper 500 PER CASE

$235.95 / CASE

IN STOCK

Professional-grade 12 x 15.5" kraft clasp envelopes built tough from 28 lb. woven paper with reinforced metal clasps for repeated use and secure, cost-effective shipping. Each case contains 500 envelopes–ideal for mailroom operations and industrial shipping needs. Gummed flap provides a permanent seal when moistened.

Envelopes & Mailers

12x15.5 28 lb Kraft Clasp Envelopes 500/Case

PN: EN1009

12 x 15 1/2 in 28 lb. Woven Paper 500 PER CASE

$230.20 / CASE

IN STOCK

Ship with confidence using these 6x9" white Tyvek® self-seal envelopes–10x stronger than paper and built to resist tears, punctures, and moisture. Constructed from durable 14 lb. olefin with reliable self-adhesive closure. Sold by the case of 100.

Envelopes & Mailers

6x9 White Self-Seal Tyvek Envelopes 100/Case

PN: TYF0609WH

6 x 9 in 14 lb. Olefin 100 PER CASE

$42.86 / CASE

IN STOCK

Ship with confidence using these 7.5x10.5 white Tyvek self-seal envelopes–10 times stronger than paper and engineered to withstand rough handling. Constructed from durable 14 lb. olefin with built-in self-adhesive closure for fast, compliant shipping. Sold by the case of 100.

Envelopes & Mailers

7.5x10.5 White Self-Seal Tyvek Envelopes 100/Case

PN: TYF0710WH

7 1/2 x 10 1/2 in 14 lb. Olefin 100 PER CASE

$50.34 / CASE

IN STOCK

Ship with confidence using these 9x12 white Tyvek self-seal envelopes. Made from durable 14 lb. olefin material–10 times stronger than standard paper envelopes–they resist tears, punctures, and moisture while maintaining a professional appearance. Order by the case (100 units) and enjoy wholesale pricing with reliable delivery.

Envelopes & Mailers

9x12 White Self-Seal Tyvek Envelopes 100/Case

PN: TYF0912WH

9 x 12 in 14 lb. Olefin 100 PER CASE

$54.44 / CASE

IN STOCK

Premium 9x12 Tyvek First Class envelopes deliver 10x the tear resistance of paper mailers with built-in self-seal closure and First Class printed borders. Constructed from 14 lb. olefin material for superior puncture, tear, and moisture protection. Case of 100 units ensures consistent, compliant shipping.

Envelopes & Mailers

9x12 Tyvek Envelopes 100/Case

PN: TYF0912FC

9 x 12 in 14 lb. Olefin 100 PER CASE

$56.76 / CASE

IN STOCK

9x12" Tyvek Envelopes - 14 lb Olefin, Case of 100

Envelopes & Mailers

9x12 14 lb Tamper Evident Tyvek Envelopes 100/Case

PN: TYF0912TE

9 x 12 in 14 lb. Olefin 100 PER CASE

$116.48 / CASE

IN STOCK

Professional black Tyvek® envelopes designed for industrial shipping and secure document mailing. 10 times stronger than paper with self-sealing closure for ease of use. Case of 100 units–reliable protection for high-volume operations.

Envelopes & Mailers

9x12 Black Self-Seal Tyvek Envelopes 100/Case

PN: TYC912B

9 x 12 in 14 lb. Olefin 100 PER CASE

$135.53 / CASE

IN STOCK

Envelopes & Mailers

9x12 Green Self-Seal Tyvek Envelopes 100/Case

PN: TYC912G

9 x 12 in 14 lb. Olefin 100 PER CASE

$135.53 / CASE

IN STOCK

Professional-grade 12 x 9" red Tyvek® envelopes engineered for maximum durability and compliance. Constructed from 14 lb. olefin material–10 times stronger than paper–with self-seal closure for secure, hands-free sealing. Waterproof and tear-resistant design protects contents during shipping and storage.

Envelopes & Mailers

12x9 Red Self-Seal Tyvek Envelopes 100/Case

PN: TYC912R

12 x 9 in 14 lb. Olefin 100 PER CASE

$135.53 / CASE

IN STOCK

Envelopes & Mailers

9x12 Silver Self-Seal Tyvek Envelopes 100/Case

PN: TYC912S

9 x 12 in 14 lb. Olefin 100 PER CASE

$135.53 / CASE

IN STOCK

Professional-grade 9x12 yellow Tyvek® envelopes featuring self-seal closure and 14 lb. olefin construction–10 times stronger than standard paper mailers. Waterproof, tear-resistant, and built for demanding shipping environments. Sold by the case of 100.

Envelopes & Mailers

9x12 Yellow Self-Seal Tyvek Envelopes 100/Case

PN: TYC912Y

9 x 12 in 14 lb. Olefin 100 PER CASE

$135.53 / CASE

IN STOCK

Protect your shipments with 9.5x12.5" white Tyvek self-seal envelopes built from 14 lb. olefin–10 times stronger than paper mailers. These tear-resistant, waterproof flat mailers feature quick self-adhesive closure for fast, reliable shipping compliance. Case of 100.

Envelopes & Mailers

9.5x12.5 White Self-Seal Tyvek Envelopes 100/Case

PN: TYF091212WH

9 1/2 x 12 1/2 in 14 lb. Olefin 100 PER CASE

$60.23 / CASE

IN STOCK

10x13" White Tyvek® Self-Seal Flat Envelopes - Tear & Puncture Resistant, Case of 100

Envelopes & Mailers

10x13 White Self-Seal Tyvek Envelopes 100/Case

PN: TYF1013WH

10 x 13 in 14 lb. Olefin 100 PER CASE

$56.02 / CASE

IN STOCK

10x13 Tyvek First Class Mailers, 14lb Olefin, Self-Seal, Case of 100

Envelopes & Mailers

10x13 14 lb Self-Seal Tyvek Envelopes 100/Case

PN: TYF1013FC

10 x 13 in 14 lb. Olefin 100 PER CASE

$62.54 / CASE

IN STOCK

10x13" Tyvek Envelopes - 14lb Olefin, Case of 100

Envelopes & Mailers

10x13 14 lb Tamper Evident Tyvek Envelopes 100/Case

PN: TYF1013TE

10 x 13 in 14 lb. Olefin 100 PER CASE

$122.08 / CASE

IN STOCK

10x13 Black Tyvek Self-Seal Mailers - Tear Resistant, Case of 100

Envelopes & Mailers

10x13 Black Self-Seal Tyvek Envelopes 100/Case

PN: TYC1013B

10 x 13 in 14 lb. Olefin 100 PER CASE

$142.47 / CASE

IN STOCK

10x13" Green Tyvek® Self-Seal Envelopes - Tear Resistant, Case of 100

Envelopes & Mailers

10x13 Green Self-Seal Tyvek Envelopes 100/Case

PN: TYC1013G

10 x 13 in 14 lb. Olefin 100 PER CASE

$142.47 / CASE

IN STOCK

Professional-grade 10 x 13" red Tyvek® self-seal envelopes built from 14 lb. olefin material–10 times stronger than paper and fully waterproof. Each case includes 100 durable, tear-resistant mailers with easy self-adhesive closure for fast, compliant shipping. Make your packages stand out while protecting contents from puncture, moisture, and handling damage.

Envelopes & Mailers

10x13 Red Self-Seal Tyvek Envelopes 100/Case

PN: TYC1013R

10 x 13 in 14 lb. Olefin 100 PER CASE

$142.47 / CASE

IN STOCK

10 x 13" Silver Tyvek® Self-Seal Envelopes - Tear Resistant, Case of 100

Envelopes & Mailers

10x13 Silver Self-Seal Tyvek Envelopes 100/Case

PN: TYC1013S

10 x 13 in 14 lb. Olefin 100 PER CASE

$142.47 / CASE

IN STOCK

10x13" Yellow Tyvek® Self-Seal Envelopes - Tear & Waterproof, Case of 100

Envelopes & Mailers

10x13 Yellow Self-Seal Tyvek Envelopes 100/Case

PN: TYC1013Y

10 x 13 in 14 lb. Olefin 100 PER CASE

$142.47 / CASE

How to choose mailing envelopes

Size

Sizes are short side by long side, in inches. A letter sheet folded in half measures 5.5 x 8.5 in and fits a 6 x 9. A flat 8.5 x 11 sheet fits a 9 x 12, and a 10 x 13 adds an inch each way for thicker stacks. Legal 8.5 x 14 sheets fit a 9.25 x 14.5 or a 10 x 15. For binders and kits, use an expandable envelope with a 1.5 to 4 in gusset.

Postage depends on size

USPS sorts mail by shape. An envelope up to 6-1/8 in high, 11-1/2 in long and 1/4 in thick mails as a letter. A larger one up to 12 x 15 in and 3/4 in thick mails as a large envelope, which USPS also calls a flat.

USPS letter and large envelope limits
Mail shape	Max height	Max length	Max thickness	Sizes on this page
Letter	6-1/8 in	11-1/2 in	1/4 in	6 x 9, #10 business, 4 x 6.375 clasp
Large envelope or flat	12 in	15 in	3/4 in	6.5 x 9.5 to 11.5 x 14.5, including 9 x 12, 10 x 13 and 10 x 15
Over the flat limit	over 12 in	over 15 in	over 3/4 in	12 x 15.5, 13 x 19, 15 x 20 and the jumbo sizes

The 12 x 15.5 in size is half an inch longer than the large envelope maximum. Expandable envelopes packed thicker than 3/4 in also go over it. USPS sets a 3.5 x 5 in minimum for mail, so the 2.25 x 3.5 to 3.375 x 6 kraft sizes are coin and parts envelopes.

Paper, Tyvek or expandable

The flat kraft and white envelopes, the clasp envelopes and the jumbo envelopes are 28 lb paper. The Tyvek flats are 14 lb DuPont Tyvek. Colored Tyvek comes in black, green, red, silver and yellow in 9 x 12, 10 x 13 and 12 x 15.5 in. The First Class versions carry a printed First Class border. Kraft expandable envelopes are 40 lb paper and the Tyvek expandables are 18 lb.

Closure

Gummed flap: moisten the gum and press it shut for a permanent seal.
Self-seal strip: peel the release strip and press. No water or tape.
Redi-Seal: press the flap down to seal. No moisture needed.
Metal clasp with gummed flap: close it with the clasp to open and reuse it, or moisten the gum to seal it for good.
String and button: the inter-department envelopes wind shut and open again.
Ungummed flap: the jumbo envelopes have no adhesive. Close them with tape.
Tamper evident: the 9 x 12 and 10 x 13 tamper evident Tyvek envelopes show OPENED in red once the seal is broken.

Buying by the case

Every price on this page is for one full case. Small kraft envelopes come 5,000 to a case, #10 business envelopes 2,500, flat paper envelopes 250 to 2,500, clasp envelopes 500 or 1,000, Tyvek flats 100, and jumbo envelopes 100 or 250.

Volume pricing comes off at checkout: 3% at 3 or more items in the cart and 5% at 6 or more. Orders of one or two items get free ground shipping in the US at $99 or more when the checkout shipping charge is $29.95 or less. Orders of one or two items with a product subtotal of $500 or more ship free when the checkout freight rate is $120 or less. Orders of three or more items get the volume discount instead of free shipping.

For pallet quantities, a standing order or a mix of sizes, send the SKUs, case counts and delivery ZIP on a bulk quote. The quote includes freight to your ZIP, and you can pay by card or ACH.

Request a bulk quote

Common questions

What are 9x12 envelopes called?

Catalog envelopes or large envelopes. A 9 x 12 holds a letter-size 8.5 x 11 sheet without folding. This page lists 9 x 12 in kraft and white paper, kraft clasp, Tyvek and expandable styles.

What are clasp envelopes?

Paper envelopes with a metal clasp and a gummed flap. The clasp holds the flap shut and opens again, so the envelope can be reused. Moisten the gum when you want a permanent seal. The clasp sizes in the table run from 4 x 6.375 to 12 x 15.5 in, all in 28 lb kraft.

Does USPS accept clasp envelopes?

Yes. For letter-size mail, USPS lists clasps, strings and buttons as nonmachinable features, and First-Class letters with them pay a nonmachinable surcharge. In the clasp table, only the 4 x 6.375 in size is letter size. The other nine sizes are large envelopes or bigger.

Are Tyvek envelopes waterproof?

The Tyvek listings describe the material as tear, puncture and moisture resistant, and several call it waterproof. For paper, the 9.5 x 12.5 kraft gummed listing says the paper is not treated for water resistance.

Which envelopes can be reused?

Clasp envelopes, string and button inter-department envelopes and the ungummed jumbo envelopes. Their listings describe reuse.

Letter and large envelope limits come from USPS Business Mail 101, Sizes for Large Envelopes and Flats and the USPS Quick Service Guide 201. Sizes, case counts, paper and Tyvek weights, closures, reuse and resistance notes come from the product listings.

Buying path

Buy Mailing Envelopes by the specs that change the order

Use filters, product titles, and product pages to compare size, material, pack count, case quantity, and fit before ordering.

Compare

Use filters and product titles to narrow by the specs that affect fit.

Confirm

Open the product page before ordering a case so you can check quantity, unit, and limits.

Reorder

Save the SKU or product link for repeat purchasing and support questions.

Larger orders

For pallet, recurring, or mixed-SKU orders, send your list and ZIP and get a delivered price by email.

What to check first

Usable inside size
Padding or material
Closure type
Case quantity

Common wrong-order risk: Forgetting item thickness. A mailer that fits flat dimensions can still be too tight once the product is packed.

Compare mailer vs box -> Get a delivered quote for larger orders -> Read the mailers guide -> View products below ->

Mailing Envelopes

How to choose mailing envelopes

Size

Postage depends on size

Paper, Tyvek or expandable

Closure

Buying by the case

Common questions

Related

Product Help Request

Buy Mailing Envelopes by the specs that change the order

What to check first