Boxes & Mailers

SELECTION EXPERT ADVICE

Wall Strength & Load Capacity
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Match single-, double-, or triple-wall corrugated construction to your product weight to prevent in-transit damage and minimize costly returns.
Dimensional Weight Cost Control
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Right-sized boxes cut carrier DIM weight charges, selecting the optimal LxWxH for each SKU directly lowers your per-shipment freight cost.
Mailer Box vs. RSC: Choose Correctly
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Self-locking mailer boxes suit branded DTC shipments; traditional RSC corrugated boxes are ideal for palletized B2B and high-volume fulfillment.

Need help choosing boxes?

Pick the right corrugated box without overpaying for size or strength

Use these buying guides to size your box, compare board strength, and avoid dimensional weight surcharges.

Corrugated Boxes Guide → How to choose size, strength, and wall type Box Size Calculator → Find the smallest safe box for your product 32 ECT vs 200 lb Test → Which board strength rating fits your shipment
Overview

3,094 corrugated boxes, literature mailers and mailing tubes from 2 to 36 inches, mostly ECT-32 kraft and white, sold in bundles of 10 to 50. Each listing shows inside dimensions, board grade and bundle count so you can match a carton to the part you ship. Orders ship from five US regional warehouses; for mixed or recurring orders use the bulk quote path with SKU, quantity and destination ZIP.

Related collections

IN STOCK Professional-grade black poly mailers with integrated self-seal closure keep your shipments secure and protected. Each 14.5x19" mailer features 2.5 mil polyethylene construction that resists punctures, tears, water, and tampering–ideal for e-commerce brands requiring reliable packaging. Ship 100 units per case with labels and stamps that adhere perfectly to the colored exterior and silver lining.
Envelopes & Mailers

14.5x19 2.5 Mil Black Self-Seal Poly Mailers 100/Case

PN: CPM1419BK

14 1/2 x 19 in 2.5 Mil Polyethylene 100 PER CASE
$56.09 / CASE
IN STOCK Professional-grade 12x15.5" pink self-seal poly mailers with 2.5 mil polyethylene construction deliver the durability and branded appearance your e-commerce shipments demand. Puncture-resistant, waterproof, and tamper-evident with high-strength seams that keep contents secure. Sold as a case of 100 for cost-effective bulk shipping.
Envelopes & Mailers

12x15.5 2.5 Mil Pink Self-Seal Poly Mailers 100/Case

PN: CPM1215P

12 x 15 1/2 in 2.5 Mil Polyethylene 100 PER CASE
$35.24 / CASE
IN STOCK Professional 12x15.5" yellow poly mailers with self-seal closure protect your shipments from moisture, tears, and tampering. 2.5 mil puncture-resistant polyethylene in a case of 100. Silver inner lining accepts labels, stamps, and ink for branded presentation.
Envelopes & Mailers

12x15.5 2.5 Mil Yellow Self-Seal Poly Mailers 100/Case

PN: CPM1215Y

12 x 15 1/2 in 2.5 Mil Polyethylene 100 PER CASE
$35.24 / CASE
IN STOCK Professional red poly mailers combine eye-catching color with industrial durability. Each 12x15.5" self-seal mailing bag features 2.5 mil polyethylene construction with puncture, water, and tear resistance. Sold by the case of 100–trusted by e-commerce brands for secure product presentation.
Envelopes & Mailers

12x15.5 2.5 Mil Red Self-Seal Poly Mailers 100/Case

PN: CPM1215R

12 x 15 1/2 in 2.5 Mil Polyethylene 100 PER CASE
$38.06 / CASE
IN STOCK Protect your shipments with our 12x15.5" blue self-seal poly mailers–engineered for puncture, tear, and water resistance. Each case includes 100 durable 2.5 mil polyethylene mailers with high-strength seams and a professional blue exterior that attracts customer attention while the silver inner lining accepts labels and stamps perfectly.
Envelopes & Mailers

12x15.5 Blue Self-Seal Poly Mailers 100/Case

PN: CPM1215BL

12 x 15 1/2 in 2.5 Mil Polyethylene 100 PER CASE
$38.06 / CASE
IN STOCK Professional 12x15.5" black poly mailers with self-seal closure protect your products in transit. These 2.5 mil polyethylene envelopes offer puncture, water, tear, and tamper resistance with high-strength seams that stay sealed even when overpacked. Includes 100 mailers per case–ideal for branded shipping at scale.
Envelopes & Mailers

12x15.5 2.5 Mil Black Self-Seal Poly Mailers 100/Case

PN: CPM1215BK

12 x 15 1/2 in 2.5 Mil Polyethylene 100 PER CASE
$38.06 / CASE
IN STOCK 10x13 Pink Self-Seal Poly Mailers 2.5 Mil - Puncture Resistant, Case of 100
Envelopes & Mailers

10x13 2.5 Mil Pink Self-Seal Poly Mailers 100/Case

PN: CPM1013P

10 x 13 in 2.5 Mil Polyethylene 100 PER CASE
$25.97 / CASE
IN STOCK Professional 10x13" yellow poly mailers combine eye-catching color with reliable protection. These self-seal, puncture-resistant polyethylene mailers feature silver inner lining and strong seams to keep contents secure. Case of 100 mailers ideal for e-commerce brands seeking durable, cost-effective shipping solutions.
Envelopes & Mailers

10x13 2.5 Mil Yellow Self-Seal Poly Mailers 100/Case

PN: CPM1013Y

10 x 13 in 2.5 Mil Polyethylene 100 PER CASE
$25.97 / CASE
IN STOCK 10x13 Red Poly Mailers 2.5 Mil Self-Seal Waterproof - Case of 100
Envelopes & Mailers

10x13 2.5 Mil Red Self-Seal Poly Mailers 100/Case

PN: CPM1013R

10 x 13 in 2.5 Mil Polyethylene 100 PER CASE
$25.97 / CASE
IN STOCK 10x13 Blue Poly Mailers Self-Seal 2.5 Mil - Case of 100
Envelopes & Mailers

10x13 2.5 Mil Blue Self-Seal Poly Mailers 100/Case

PN: CPM1013BL

10 x 13 in 2.5 Mil Polyethylene 100 PER CASE
$25.97 / CASE
IN STOCK 10x13 Black Poly Mailers 2.5 Mil Self-Seal, Case of 100
Envelopes & Mailers

10x13 2.5 Mil Black Self-Seal Poly Mailers 100/Case

PN: CPM1013BK

10 x 13 in 2.5 Mil Polyethylene 100 PER CASE
$25.97 / CASE
IN STOCK Keep internal mail organized and routed efficiently with these 13" x 10" blue inter-department envelopes. String and button closure allows repeated use, while pre-printed columns for Date, Deliver To, Department, Sent By, and Department track up to 31 entries per envelope. Buy by the case of 100.
Envelopes & Mailers

13x10 Blue String Closure Inter-Department Envelopes 100/Case

PN: EN1097

13 x 10 in Paper Stock 100 PER CASE
$110.56 / CASE
IN STOCK 10x13" Yellow Inter-Department Envelopes String Closure - Case of 100
Envelopes & Mailers

10x13 Yellow String Closure Inter-Department Envelopes 100/Case

PN: EN1096

10 x 13 in Paper Stock 100 PER CASE
$110.71 / CASE
IN STOCK Keep internal mail organized and routed efficiently with these red 10x13" inter-department envelopes. Pre-printed with 5 tracking columns (Date, Deliver To, Department, Sent By, Department) and durable string-tie closure for repeated use. Case of 100 envelopes.
Envelopes & Mailers

10x13 Red String Closure Inter-Department Envelopes 100/Case

PN: EN1095

10 x 13 in Paper Stock 100 PER CASE
$110.54 / CASE
IN STOCK 10x13" Clear View Poly Mailers, 2.5 Mil Self-Seal, Case of 500
Envelopes & Mailers

10x13 2.5 Mil Self-Seal Clear View Poly Mailers 500/Case

PN: CV1013

10 x 13 in 2.5 Mil Polyethylene 500 PER CASE
$91.99 / CASE
IN STOCK Display products while protecting shipments. These 9x12" clear view poly mailers feature a reliable self-seal closure and tear-resistant 2.5 mil polyethylene construction. Sold by the case of 500–the professional mailer choice for e-commerce brands prioritizing product presentation and shipping security.
Envelopes & Mailers

9x12 2.5 Mil Self-Seal Clear View Poly Mailers 500/Case

PN: CV912

9 x 12 in 2.5 Mil Polyethylene 500 PER CASE
$79.68 / CASE

Product Help Request

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

Buying path

Buy Boxes & 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

  • Inside dimensions
  • Board grade or strength rating
  • Box style and closure
  • Case or bundle quantity
Common wrong-order risk: Choosing the outside size instead of the inside size. Confirm product fit, void fill, and storage space before ordering.
Use the box size finder -> Get a delivered quote for larger orders -> Compare corrugated box types -> View products below ->