Rigid Mailers

Rigid mailers are flat paperboard envelopes that keep photos, prints and documents from bending in the mail. Each table lists the stocked sizes, short side first in inches, with mailers per case, the case price, the price per mailer and live stock. Add puts one case in your cart.

Rigid mailers 5 1/8 x 5 1/8 to 7 x 9 in
Size, inColor, board, closureMailers per casePrice per casePrice per mailerCase weightStockOrder
5 1/8 x 5 1/8White, .020 chipboard, self-seal 200 $58.2429.1¢ 9.24 lb In stock
6 x 6Kraft, .028 chipboard, self-seal 200 $58.2429.1¢ 12.98 lb In stock
6 x 6White, .020 chipboard, self-seal 200 $60.0630.0¢ 11.68 lb In stock
6 x 6White, .028 chipboard, tab lock 200 $53.3326.7¢ 11.4 lb In stock
6 x 8Kraft, .028 chipboard, self-seal 100 $35.4935.5¢ 8.56 lb In stock
6 x 8Kraft, .036 chipboard, tab lock 100 $29.1229.1¢ 10.82 lb In stock
6 x 8White, .018 chipboard, self-seal, side loading 200 $63.9732.0¢ 13.48 lb In stock
6 x 8White, .020 chipboard, self-seal 100 $41.0841.1¢ 10.18 lb In stock
6 x 8White, .028 chipboard, tab lock 100 $30.9430.9¢ 9.8 lb In stock
6 x 9White, .024 chipboard, self-seal, side loading 200 $104.6552.3¢ 19.08 lb In stock
6 x 9 1/2White, .018 chipboard, self-seal, side loading 200 $75.4437.7¢ 17.06 lb In stock
7 x 9Kraft, .028 chipboard, self-seal 100 $48.5548.6¢ 10.76 lb In stock
7 x 9White, .018 chipboard, self-seal, side loading 200 $84.7742.4¢ 18.06 lb In stock
7 x 9White, .020 chipboard, self-seal 100 $43.5943.6¢ 12.32 lb In stock
7 x 9White, .028 chipboard, tab lock 100 $40.8240.8¢ 11.72 lb In stock
Rigid mailers 7 1/4 x 10 1/2 to 10 1/2 x 14 in
Size, inColor, board, closureMailers per casePrice per casePrice per mailerCase weightStockOrder
7 1/4 x 10 1/2Kraft, laminated fiberboard, self-seal 250 $208.2683.3¢ 34.7 lb In stock
7 3/4 x 10White, .020 chipboard, self-seal, 1 in gusset 100 $69.1669.2¢ 13.66 lb In stock
8 1/2 x 10 1/2Kraft, laminated fiberboard, self-seal 250 $242.4297.0¢ 36.78 lb In stock
9 x 11 1/2Kraft, .028 chipboard, self-seal 100 $52.7852.8¢ 16.32 lb In stock
9 x 11 1/2Kraft, .036 chipboard, tab lock 100 $46.3746.4¢ 21.24 lb In stock
9 x 11 1/2White, .018 chipboard, self-seal, side loading 200 $101.1550.6¢ 28.64 lb In stock
9 x 11 1/2White, .020 chipboard, self-seal 100 $56.9857.0¢ 19.34 lb In stock
9 x 11 1/2White, .028 chipboard, tab lock 100 $48.2348.2¢ 19.66 lb In stock
9 x 11 1/2White, paperboard, self-seal, top loading 100 $66.2566.3¢ 21.4 lb In stock
9 1/2 x 12 1/2White, .012 chipboard, self-seal, side loading 250 $124.4249.8¢ 25.0 lb In stock
9 1/2 x 12 1/2White, .020 chipboard, self-seal, 1 in gusset 100 $75.5375.5¢ 19.38 lb In stock
9 1/2 x 13Kraft, laminated fiberboard, self-seal 200 $241.02$1.21 41.9 lb In stock
9 3/4 x 12 1/4Kraft, .028 chipboard, self-seal 100 $54.6054.6¢ 19.7 lb In stock
9 3/4 x 12 1/4Kraft, .036 chipboard, tab lock 100 $48.2348.2¢ 24.6 lb In stock
9 3/4 x 12 1/4White, .018 chipboard, self-seal, side loading 200 $111.0355.5¢ 31.98 lb In stock
9 3/4 x 12 1/4White, .020 chipboard, self-seal 100 $60.5360.5¢ 23.34 lb In stock
9 3/4 x 12 1/4White, .028 chipboard, self-seal, side loading 100 $80.9981.0¢ 23.18 lb In stock
9 3/4 x 12 1/4White, .028 chipboard, tab lock 100 $52.6852.7¢ 20.84 lb In stock
10 1/2 x 14Kraft, laminated fiberboard, self-seal 150 $223.42$1.49 36.64 lb In stock
Rigid mailers 11 x 13 1/2 to 14 1/2 x 18 1/2 in
Size, inColor, board, closureMailers per casePrice per casePrice per mailerCase weightStockOrder
11 x 13 1/2Kraft, .028 chipboard, self-seal 100 $65.5265.5¢ 23.72 lb In stock
11 x 13 1/2Kraft, .036 chipboard, tab lock 100 $58.7358.7¢ 31.56 lb In stock
11 x 13 1/2White, .018 chipboard, self-seal, side loading 200 $109.1954.6¢ 39.46 lb In stock
11 x 13 1/2White, .020 chipboard, self-seal 100 $70.8670.9¢ 27.44 lb In stock
11 x 13 1/2White, .028 chipboard, tab lock 100 $59.1559.2¢ 20.78 lb In stock
11 x 16Kraft, .036 chipboard, tab lock 100 $71.0771.1¢ 34.98 lb In stock
12 1/2 x 15Kraft, laminated fiberboard, self-seal 100 $210.93$2.11 31.98 lb In stock
12 3/4 x 15Kraft, .028 chipboard, self-seal 100 $77.9678.0¢ 30.48 lb In stock
12 3/4 x 15Kraft, .036 chipboard, tab lock 100 $67.5167.5¢ 38.74 lb In stock
12 3/4 x 15White, .020 chipboard, self-seal 100 $80.9881.0¢ 33.96 lb In stock
12 3/4 x 15White, .028 chipboard, tab lock 100 $68.2268.2¢ 35.48 lb In stock
13 x 18Kraft, .028 chipboard, self-seal 100 $92.0892.1¢ 35.56 lb In stock
13 x 18Kraft, .036 chipboard, tab lock 100 $73.7173.7¢ 44.9 lb In stock
13 x 18White, .020 chipboard, self-seal 100 $114.06$1.14 40.68 lb In stock
13 x 18White, .028 chipboard, tab lock 100 $80.3780.4¢ 41.14 lb In stock
14 1/2 x 18 1/2Kraft, laminated fiberboard, self-seal 75 $202.07$2.69 31.46 lb In stock
Rigid mailers 17 x 21 to 22 x 27 in
Size, inColor, board, closureMailers per casePrice per casePrice per mailerCase weightStockOrder
17 x 21Black, .028 chipboard, self-seal 100 $209.30$2.09 63.94 lb In stock
17 x 21Kraft, .028 chipboard, self-seal 100 $138.54$1.39 53.44 lb In stock
17 x 21Kraft, .036 chipboard, tab lock 50 $58.70$1.17 33.88 lb In stock
17 x 21White, .020 chipboard, self-seal 100 $145.24$1.45 67.0 lb In stock
17 x 21White, .028 chipboard, tab lock 100 $124.45$1.24 65.78 lb In stock
18 x 24Kraft, .028 chipboard, self-seal 50 $97.83$1.96 32.88 lb In stock
18 x 24Kraft, .036 chipboard, tab lock 50 $80.99$1.62 41.2 lb In stock
18 x 24White, .020 chipboard, self-seal 50 $106.76$2.14 40.54 lb In stock
18 x 24White, .028 chipboard, tab lock 50 $107.38$2.15 38.82 lb In stock
20 x 27Kraft, .028 chipboard, self-seal 50 $129.58$2.59 40.46 lb In stock
20 x 27Kraft, .036 chipboard, tab lock 50 $105.47$2.11 50.8 lb In stock
20 x 27White, .028 chipboard, self-seal 50 $116.48$2.33 48.8 lb In stock
20 x 27White, .028 chipboard, tab lock 50 $119.21$2.38 46.04 lb In stock
22 x 27Kraft, .036 chipboard, tab lock 50 $124.37$2.49 56.75 lb In stock
22 x 27White, .028 chipboard, self-seal 50 $141.87$2.84 52.15 lb In stock
IN STOCK Professional 6x6" white self-seal stayflat mailers made from durable .020 chipboard provide superior puncture resistance and document protection without additional stiffeners. Featuring a convenient peel-and-seal closure with pull-tab tear strip for quick opening. Sold by the case of 200 units–lightweight design saves on freight costs.
Envelopes & Mailers

6x6 White Self-Seal Chipboard Stayflats Plus Mailers 200/Case

PN: RM9SS

6 x 6 in .020 Chipboard 200 PER CASE
$60.06 / CASE
IN STOCK Professional-grade 5 1/8" x 5 1/8" white self-seal Stayflats Plus mailers built from sturdy .020 chipboard–no additional stiffeners required. Peel-and-seal closure with easy-tear pull tab strip ensures reliable sealing and effortless opening. Sold as a case of 200 mailers.
Envelopes & Mailers

5 1/8 x 5 1/8 in White Chipboard Self-Seal Stayflats Plus Mailers 200/Case

PN: RM8SS

5 1/8 x 5 1/8 in .020 Chipboard 200 PER CASE
$58.24 / CASE
IN STOCK Industry-standard 9.5x12.5" white chipboard express mailers with reliable peel-and-seal closure and pull-tab tear strip. Lightweight .012 chipboard construction requires no additional stiffeners, reducing postage costs while maintaining puncture resistance. Sold by the case of 250 units.
Envelopes & Mailers

9.5x12.5 White Self-Seal Chipboard Stayflats Mailers 250/Case

PN: RM1EP

9 1/2 x 12.5 in .012 Chipboard 250 PER CASE
$124.42 / CASE
IN STOCK Packrift's 9x11.5" Stayflats® do not bend mailers combine professional protection with cost-effective shipping for e-commerce brands. White recycled paperboard construction with self-seal, pressure-sensitive closure and pre-printed Do Not Bend messaging. Sold by the case (100 units).
Envelopes & Mailers

9x11.5 White Stayflats Mailers 100/Case

PN: RM2DNB

9 x 11 1/2 in Paperboard 100 PER CASE
$66.25 / CASE
IN STOCK Professional white side loading stayflat mailers engineered for e-commerce brands shipping documents and photos. .028 chipboard construction with peel-and-seal closure and pull-tab tear strip for effortless opening. Lightweight design reduces postage costs without sacrificing protection–100 per case.
Envelopes & Mailers

9.75x12.25 White Self-Seal Side Loading Chipboard Stayflats Lite Mailers 100/Case

PN: RM129

9 3/4 x 12.25 in .028 Chipboard 100 PER CASE
$80.99 / CASE
IN STOCK Protect documents and photos with confidence using our 6x9 white chipboard side loading Stayflats Lite® mailers. These self-seal, self-adhesive mailing flats feature a peel-and-seal closure with pull-tab tear strip for hassle-free sealing and opening. Sold as a case of 200 lightweight mailers that require no additional stiffeners.
Envelopes & Mailers

6x9 White Side Loading Chipboard Stayflats Lite Mailers 200/Case

PN: RM19SS

6 x 9 in .024 Chipboard 200 PER CASE
$104.65 / CASE
IN STOCK Professional 27 x 22" kraft stayflat mailers engineered for e-commerce brands shipping photos, documents, and flat goods. Heavy-duty .036 chipboard with tab lock closure delivers puncture resistance and consistent protection without additional stiffeners. Lightweight design reduces postage costs–50 mailers per case.
Envelopes & Mailers

27x22 Kraft Chipboard Tab Lock Stayflats Mailers 50/Case

PN: RM27

27 x 22 in .036 Chipboard 50 PER CASE
$124.37 / CASE
IN STOCK Professional 27x20" kraft stayflat mailers with tab lock closure protect your e-commerce shipments without adding bulk or cost. Made from durable .036 chipboard that requires no additional stiffeners, these heavy-duty flat mailers keep documents and photos pristine while staying lightweight to maximize postage savings. Order by the case of 50.
Envelopes & Mailers

27x20 Kraft Chipboard Tab Lock Stayflats Mailers 50/Case

PN: RM12

27 x 20 in .036 Chipboard 50 PER CASE
$105.47 / CASE
IN STOCK Professional 18 x 24" kraft stayflats mailers featuring tab lock closure and .036 chipboard construction for maximum puncture resistance. Lightweight design eliminates postage overages while delivering rigid protection–no additional stiffeners needed. Sold by the case of 50.
Envelopes & Mailers

18x24 Kraft Chipboard Tab Lock Stayflats Mailers 50/Case

PN: RM11

18 x 24 in .036 Chipboard 50 PER CASE
$80.99 / CASE
IN STOCK Professional 17x21" kraft stayflat mailers with tab lock closure protect documents and photos without additional stiffeners. Manufactured from durable .036 chipboard with lightweight design that reduces postage costs. Sold by the case of 50 units.
Envelopes & Mailers

17x21 Kraft Chipboard Tab Lock Stayflats Mailers 50/Case

PN: RM7

17 x 21 in .036 Chipboard 50 PER CASE
$58.70 / CASE
IN STOCK Protect high-value shipments with 18 x 13" kraft stayflat mailers engineered for e-commerce brands. .036 chipboard construction with tab lock closure delivers puncture resistance without added stiffeners. Lightweight design reduces postage costs–100 mailers per case.
Envelopes & Mailers

18x13 Kraft Chipboard Tab Lock Stayflats Mailers 100/Case

PN: RM6

18 x 13 in .036 Chipboard 100 PER CASE
$73.71 / CASE
IN STOCK Rigid .036 kraft chipboard stayflats mailers with integrated tab lock closure–no additional stiffeners needed. Perfect for e-commerce brands shipping photos, documents, and flat goods. Lightweight design reduces postage costs while maintaining professional presentation. Sold by the case of 100.
Envelopes & Mailers

15x12.75 Kraft Chipboard Tab Lock Stayflats Mailers 100/Case

PN: RM4

15 x 12.75 in .036 Chipboard 100 PER CASE
$67.51 / CASE
IN STOCK Professional-grade 11x16" kraft stayflat mailers featuring rigid .036 chipboard construction and reliable tab lock closure. Perfect for e-commerce brands shipping photos, documents, and flat merchandise. Sold by the case of 100–no additional stiffeners needed.
Envelopes & Mailers

11x16 Kraft Tab Lock Rigid Stayflats Mailers 100/Case

PN: RM8

11 x 16 in .036 Chipboard 100 PER CASE
$71.07 / CASE
IN STOCK Professional-grade 11x13.5" kraft stayflats® mailers protect documents, photos, and merchandise with rigid .036 chipboard construction and patented tab lock closure. Lightweight design saves postage costs while eliminating the need for additional stiffeners–ship 100 pieces per case with zero bend damage.
Envelopes & Mailers

11x13.5 Kraft Tab Lock Stayflats Mailers 100/Case

PN: RM3

11 x 13 1/2 in .036 Chipboard 100 PER CASE
$58.73 / CASE
IN STOCK Protect documents, photos, and merchandise with professional-grade 9 3/4 x 12 1/4" kraft stayflat mailers featuring reliable tab lock closure. Manufactured from sturdy .036 chipboard with no additional stiffeners needed, these lightweight hard mailers reduce postage costs while ensuring puncture-resistant delivery. Case of 100 units.
Envelopes & Mailers

9 3/4 x 12 1/4 in Kraft Stayflats Tab Lock Mailers 100/Case

PN: RM5

9 3/4 x 12 1/4 in .036 Chipboard 100 PER CASE
$48.23 / CASE
IN STOCK Protect high-value shipments with our 9x11.5" Kraft Stayflats® mailers featuring reliable tab lock closure and .036 chipboard construction. Self-sealing design eliminates extra materials, reduces postage costs, and arrives professionally ready for your e-commerce customers. Case of 100 per box.
Envelopes & Mailers

9x11.5 Kraft Chipboard Tab Lock Stayflats Mailers 100/Case

PN: RM2

9 x 11 1/2 in .036 Chipboard 100 PER CASE
$46.37 / CASE
IN STOCK Protect your shipments with these professional-grade 8x6" kraft stayflat mailers featuring a secure tab lock closure. Made from .036 chipboard, they require no additional stiffeners and keep postage costs low while ensuring documents and photos arrive damage-free. Order by the case (100 units) for e-commerce shipping confidence.
Envelopes & Mailers

8x6 Kraft Chipboard Tab Lock Stayflats Mailers 100/Case

PN: RM1

8 x 6 in .036 Chipboard 100 PER CASE
$29.12 / CASE
IN STOCK Professional-grade 27 x 20" kraft self-seal stayflats mailers with .028 chipboard construction deliver maximum puncture resistance without added stiffeners. Peel-and-seal closure with easy tear strip keeps shipping costs low while protecting documents, photos, and flat goods. Sold by the case of 50.
Envelopes & Mailers

27x20 Kraft Self-Seal Stayflats Plus Mailers 50/Case

PN: RM12PSK

27 x 20 in .028 Chipboard 50 PER CASE
$129.58 / CASE
IN STOCK Professional-grade 18x24" kraft stayflat mailers with .028 chipboard construction deliver reliable puncture resistance for photos, documents, and merchandise. Self-sealing closure with easy tear strip–no tape required. Lightweight design reduces postage costs while maintaining maximum protection in a case of 50 units.
Envelopes & Mailers

18x24 Kraft Self-Seal Stayflats Plus Mailers 50/Case

PN: RM11PSK

18 x 24 in .028 Chipboard 50 PER CASE
$97.83 / CASE
IN STOCK Professional-grade 21x17" kraft self-seal stayflat mailers built from .028 chipboard for maximum puncture resistance and product protection during shipping. Peel-and-seal closure with pull-tab tear strip eliminates extra materials–lightweight design reduces postage costs. Sold by the case of 100.
Envelopes & Mailers

21x17 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM7K

21 x 17 in .028 Chipboard 100 PER CASE
$138.54 / CASE
IN STOCK Professional-grade 13 x 18" kraft self-seal Stayflats Plus® mailers protect documents and photos without additional stiffeners. Made from .028 chipboard with peel-and-seal closure and easy pull-tab tear strip. Ships by the case of 100 to reduce postage costs.
Envelopes & Mailers

13x18 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM6K

13 x 18 in .028 Chipboard 100 PER CASE
$92.08 / CASE
IN STOCK Protect your products with these 12 3/4 x 15" kraft self-seal Stayflats Plus® mailers featuring .028 chipboard construction that resists puncture and bending. Peel-and-seal closure with easy tear strip–100 mailers per case. Lightweight design cuts postage costs without sacrificing durability or professional appearance.
Envelopes & Mailers

12 3/4 x 15 in Kraft Self-Seal Stayflats Plus Mailers 100-Pack

PN: RM4K

12 3/4 x 15 in .028 Chipboard 100 PER CASE
$77.96 / CASE
IN STOCK Heavy-duty 11x13.5" kraft self-seal Stayflats Plus® mailers deliver professional protection for e-commerce shipments without added stiffeners. Pre-scored .028 chipboard with peel-and-seal closure stays flat and resists puncture. Case of 100 reduces postage costs while maintaining brand presentation.
Envelopes & Mailers

11x13.5 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM3K

11 x 13 1/2 in .028 Chipboard 100 PER CASE
$65.52 / CASE
IN STOCK Professional-grade kraft self-seal stayflats plus mailers protect documents and photos with .028 chipboard construction and reliable peel-and-seal closure. 9.75" x 12.25" dimensions ship 100 per case, reducing postage costs with no stiffeners needed. Easy tear-strip opening speeds processing for high-volume e-commerce operations.
Envelopes & Mailers

9.75x12.25 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM5K

9 3/4 x 12 1/4 in .028 Chipboard 100 PER CASE
$54.60 / CASE
IN STOCK Professional-grade 9 x 11.5" kraft self-seal mailers built from .028 chipboard for maximum puncture resistance and document protection. Peel-and-seal closure with easy-tear pull tab requires no additional stiffeners, reducing shipping weight and costs. Case of 100 mailers ideal for e-commerce brands shipping photos, documents, and flat merchandise.
Envelopes & Mailers

9x11.5 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM2K

9 x 11 1/2 in .028 Chipboard 100 PER CASE
$52.78 / CASE
IN STOCK Professional-grade 7x9" kraft self-seal stayflat mailers crafted from .028 chipboard for superior puncture resistance and rigid protection. Peel-and-seal closure with pull-tab tear strip eliminates extra steps. Ships as case of 100–lightweight design reduces postage costs without sacrificing durability.
Envelopes & Mailers

7x9 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM10K

7 x 9 in .028 Chipboard 100 PER CASE
$48.55 / CASE
IN STOCK Protect your e-commerce shipments with professional-grade 6x8" kraft self-seal Stayflats Plus mailers. Manufactured from durable .028 chipboard with integrated peel-and-seal closure and easy tear strip. Ships 100 mailers per case–lightweight design reduces postage costs without sacrificing protection.
Envelopes & Mailers

6x8 Kraft Self-Seal Stayflats Plus Mailers 100/Case

PN: RM1K

6 x 8 in .028 Chipboard 100 PER CASE
$35.49 / CASE
IN STOCK Professional-grade 6x6" kraft self-seal mailers crafted from .028 chipboard for secure document and photo protection. Built-in peel-and-seal closure with easy tear strip–no additional stiffeners needed. Order 200/case to reduce shipping costs and eliminate guesswork.
Envelopes & Mailers

6x6 Kraft Self-Seal Stayflats Plus Mailers 200/Case

PN: RM9K

6 x 6 in .028 Chipboard 200 PER CASE
$58.24 / CASE
IN STOCK Professional-grade Jiffy Rigi Bag® mailers with laminated kraft fiberboard construction that eliminates the need for additional stiffeners. High-strength self-seal flap ensures contents stay secure while resisting bending, folding, and creasing. Order by the case–75 units ready to ship.
Envelopes & Mailers

14.5x18.5 Kraft Self-Seal Rigid Mailers 75/Case

PN: B826

14 1/2 x 18 1/2 in Laminated Fibreboard 75 PER CASE
$202.07 / CASE
IN STOCK Professional-grade 15x12.5 kraft rigid mailers designed for e-commerce brands shipping valuable products. Laminated fiberboard construction eliminates bending and creasing without additional stiffeners. High-strength self-seal flap with tear strip for fast, secure sealing in cases of 100.
Envelopes & Mailers

15x12.5 Kraft Self-Seal Rigid Mailers 100-Pack

PN: B825

15 x 12.5 in Laminated Fibreboard 100 PER CASE
$210.93 / CASE
IN STOCK Professional-grade 14 x 10.5" self-seal Rigi Bag mailers with laminated kraft fiberboard construction that eliminates the need for additional stiffeners. Superior corner and edge protection prevents bending, folding, and creasing during transit. Sold in cases of 150 with high-strength cohesive seal and tear strip for efficient opening.
Envelopes & Mailers

14x10.5 Kraft Self-Seal Rigid Mailers 150/Case

PN: B824

14 x 10.5 in Laminated Fibreboard 150 PER CASE
$223.42 / CASE
IN STOCK Professional-grade 9.5x13" self-seal Jiffy Rigi Bag mailers featuring laminated kraft fiberboard construction that eliminates the need for additional stiffeners. High-strength cohesive seal flap and tear strip for efficient packing and customer opening. Sold in cases of 200.
Envelopes & Mailers

9.5x13 Kraft Self-Seal Rigid Mailers 200/Case

PN: B823

9 1/2 x 13 in Laminated Fibreboard 200 PER CASE
$241.02 / CASE
IN STOCK Premium 8.5 x 13" Jiffy Rigi Bag mailers deliver superior corner and edge protection with laminated kraft fiberboard construction. High-strength self-seal flap requires no additional stiffeners–just insert, fold, and seal. Sold as case of 200 for e-commerce brands shipping small to medium items.
Envelopes & Mailers

8.5x13 Kraft Self-Seal Rigid Mailers 200/Case

PN: B822

8 1/2 x 13 in Laminated Fibreboard 200 PER CASE
$221.65 / CASE
IN STOCK Ship with confidence using these 8.5" x 10.5" self-seal Jiffy Rigi Bag® mailers featuring laminated fiberboard construction that eliminates the need for additional stiffeners. High-strength cohesive self-seal flap and integrated tear strip deliver professional presentation and effortless opening. Sold by the case of 250 units.
Envelopes & Mailers

8.5x10.5 #2 Kraft Self-Seal Rigid Mailers 250/Case

PN: B821

8 1/2 x 10 1/2 in Laminated Fibreboard 250 PER CASE
$242.42 / CASE
IN STOCK Professional-grade rigid mailers designed for e-commerce brands shipping lightweight products without additional stiffeners. Laminated fiberboard construction with high-strength self-seal flap protects contents from bending, creasing, and corner damage. Ready to use–simply insert items and fold.
Envelopes & Mailers

7.25x10.5 Kraft Self-Seal Rigid Mailers 250/Case

PN: B820

7 1/4 x 10 1/2 in Laminated Fibreboard 250 PER CASE
$208.26 / CASE
IN STOCK Professional black self-seal stayflat mailers sized 17x21" protect documents and photos during shipment without additional stiffeners. Engineered from .028 chipboard with peel-and-seal closure and easy tear strip. Lightweight design reduces freight costs–sold by the case of 100 units.
Envelopes & Mailers

17x21 Black Self-Seal Chipboard Mailers 100/Case

PN: RM1721BK

17 x 21 in .028 Chipboard 100 PER CASE
$209.30 / CASE

How to choose a rigid mailer

Size: leave room around the item

Sizes on this page are the flat size of the mailer in inches, short side first. Seams and the closure flap use part of that space, so pick a mailer at least 1/2 inch wider and 1/2 inch longer than the item.

Common items and the closest sizes here
Item Mailer sizes to start with, in
4 x 6 or 5 x 7 photo 6 x 8, 6 x 9
8 x 10 photo 8 1/2 x 10 1/2, 9 x 11 1/2
Letter paper, 8 1/2 x 11 9 x 11 1/2, 9 1/2 x 12 1/2, 9 3/4 x 12 1/4
11 x 14 print 12 1/2 x 15, 12 3/4 x 15
11 x 17 sheet 13 x 18
16 x 20 print 17 x 21
18 x 24 poster 20 x 27, 22 x 27

Board thickness

Board thickness is listed in thousandths of an inch, so a higher number means thicker board. Kraft tab lock mailers here use .036 board. Kraft self-seal chipboard mailers and white tab lock mailers use .028. White self-seal mailers are mostly .018 or .020, and a few sizes use .012, .024 or .028. The kraft laminated fiberboard mailers, 7 1/4 x 10 1/2 to 14 1/2 x 18 1/2, are a separate line with a self-seal flap.

Tab lock or self-seal

A tab lock mailer closes by tucking a tab into a slot, so no tape is needed. A self-seal chipboard mailer has an adhesive strip under a liner: peel the liner and press the flap down. The self-seal chipboard mailers here also have a tear strip, so the recipient can open them without scissors.

Gusseted, side loading and top loading styles

The 7 3/4 x 10 and 9 1/2 x 12 1/2 white self-seal mailers have a 1 inch gusset that adds depth for thicker contents. The product grid also lists 12 1/2 x 15 and 14 x 17 gusseted mailers and kraft expansion mailers 3 or 4 inches deep. Side loading mailers take the item in from the side, like a standard envelope. The table marks each side loading row. The 9 x 11 1/2 white paperboard mailer is top loading.

Postage

USPS charges the large envelope price only for pieces that bend and measure no more than 12 x 15 x 3/4 inches. The USPS Domestic Mail Manual counts a rigid flat-size piece as a parcel, so most rigid mailers pay parcel prices such as USPS Ground Advantage. The 5 1/8 x 5 1/8 to 6 x 9 1/2 sizes are letter size. Filled to no more than 1/4 inch thick and 3.5 ounces, they can mail at the First-Class letter price plus the nonmachinable surcharge for rigid letters.

Buying by the case and pallet

Every row is one case of 50 to 250 mailers. Five white self-seal sizes also come in 25-packs: 6 x 8, 9 x 11 1/2, 9 3/4 x 12 1/4, 11 x 13 1/2 and 12 3/4 x 15.

Volume pricing applies at checkout: at least 3% off when the cart holds 3 or more items and at least 5% off at 6 or more, and cases of different sizes count together. 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. Checkout shows the freight for your address before you pay.

For pallets, repeat orders or mixed sizes, request a delivered quote with freight priced for the whole order.

Request a bulk quote

Common questions

What is a stay flat mailer?

A flat envelope made of paperboard. It is also sold as a rigid mailer, photo mailer or cardboard envelope. The board keeps photos, certificates and documents flat in transit. The mailers in the tables are chipboard, recycled paperboard or laminated fiberboard.

Are rigid mailers considered envelopes for postage?

Only in letter size. A rigid piece up to 6 1/8 x 11 1/2 x 1/4 inches and 3.5 ounces mails as a First-Class letter with the nonmachinable surcharge. A larger rigid piece pays parcel prices, since USPS counts a rigid flat-size piece as a parcel.

How much does it cost to mail a rigid mailer?

Price the 7 x 9 and larger sizes as a package. USPS parcel prices depend on weight, distance and service. Thin, light pieces in the smaller sizes can mail as First-Class letters with the nonmachinable surcharge. Weigh one packed mailer, or divide the case weight by the mailer count to get the empty weight.

What is the best way to mail an 8x10 photo?

Use a rigid mailer at least 1/2 inch wider and longer than the print. For an 8 x 10, that is the 8 1/2 x 10 1/2 or the 9 x 11 1/2 size.

What size rigid mailer fits 4x6 photos?

The 6 x 8 size fits 4 x 6 and 5 x 7 prints. The 5 1/8 x 5 1/8 and 6 x 6 sizes suit square cards and prints up to 4 5/8 and 5 1/2 inches.

Related

Table prices, stock, case counts and weights come from the live catalog.

Product Help Request

Send the SKU, quantity, delivery ZIP, and any required specs so we can route the request.

Buying path

Buy Rigid Mailers 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.
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