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 Crystal-clear 2 mil poly document envelopes designed for e-commerce fulfillment and 3PL operations. The 6x12" size fits standard packing lists with full document visibility through the transparent face. Tamper-evident construction protects contents while reducing re-scanning errors.
Packing List Envelopes

6x12 2 Mil Clear Self-Adhesive Packing List Envelopes 1000/Case

PN: PL475

6 x 12 in 2 Mil Poly 1000 PER CASE
$102.18 / CASE
IN STOCK 6x9" Clear Document Envelopes, 2 Mil Poly, 1000/Case - Tamper Proof
Packing List Envelopes

6x9 2 Mil Clear Tamper Proof Packing List Envelopes 1000/Case

PN: PL474

6 x 9 in 2 Mil Poly 1000 PER CASE
$79.00 / CASE
IN STOCK Crystal-clear 2 Mil poly envelopes (5.5" x 10") let your packing lists and shipping documents stay visible and protected. These tamper-evident document envelopes provide adhesion strength and durability for high-volume e-commerce and 3PL operations. Buy bulk–1,000 per case, ready to back-load.
Packing List Envelopes

5.5x10 2 Mil Clear Self-Adhesive Packing List Envelopes 1000/Case

PN: PL28

5 1/2 x 10 in 2 Mil Poly 1000 PER CASE
$68.55 / CASE
IN STOCK Crystal-clear transparency lets recipients instantly verify contents without opening. These 2 mil poly packing list envelopes provide tamper-evident security while maintaining complete document visibility. Perfect for e-commerce, 3PL, and logistics operations requiring back-load efficiency–1,000 envelopes per case.
Packing List Envelopes

5.5x4.5 2 Mil Clear Face Packing List Envelopes 1000/Case

PN: PL522

5 1/2 x 4.5 in 2 Mil Poly 1000 PER CASE
$45.01 / CASE
IN STOCK 5 1/8 x 8" Clear 2 Mil Document Envelopes - Tamper Proof, Case 1000
Packing List Envelopes

5 1/8 x 8 in 2 Mil Clear Tamper Proof Document Envelopes 1000/Case

PN: PL473

5 1/8 x 8 in 2 Mil Poly 1000 PER CASE
$58.92 / CASE
IN STOCK Crystal-clear 2 mil poly document envelopes designed for e-commerce and 3PL operations. Your packing lists and shipping documents are immediately visible through the transparent face–no guesswork on what's inside. Tamper-proof seal keeps contents secure while reducing handling time at pickup.
Packing List Envelopes

4.5x7.5 2 Mil Clear Tamper Proof Self-Adhesive Packing List Envelopes 1000/Case

PN: PL472

4 1/2 x 7.5 in 2 Mil Poly 1000 PER CASE
$49.08 / CASE
IN STOCK Professional-grade 4.5x6 clear face document envelopes with 2 mil poly thickness and tamper-evident security. Transparent design ensures packing lists and shipping documents are instantly readable without opening packages. Ships in full cases of 1,000 units.
Packing List Envelopes

4.5x6 2 Mil Clear Tamper Proof Packing List Envelopes 1000/Case

PN: PL5

4 1/2 x 6 in 2 Mil Poly 1000 PER CASE
$36.87 / CASE
IN STOCK These 4.5x5.5" clear face document envelopes feature 2 mil tamper-proof polyethylene construction for maximum document visibility and security. Sold as a case of 1,000 units, they're ideal for e-commerce operations, 3PL facilities, and fulfillment centers that need reliable packing list and invoice holders with proven adhesion strength.
Packing List Envelopes

4.5x5.5 2 Mil Clear Packing List Envelopes 1000/Case

PN: PL11

4 1/2 x 5.5 in 2 Mil Poly 1000 PER CASE
$32.29 / CASE
IN STOCK Crystal-clear 2 mil poly document envelopes designed for e-commerce and 3PL operations. Your packing lists, shipping labels, and miscellaneous documents stay visible and protected through the transparent poly face. Tamper-evident design keeps contents secure during transit. 1000 envelopes per case.
Packing List Envelopes

4x3 2 Mil Clear Face Packing List Envelopes 1000/Case

PN: PL521

4 x 3 in 2 Mil Poly 1000 PER CASE
$35.58 / CASE
IN STOCK Crystal-clear 2 mil poly document envelopes designed for e-commerce and 3PL operations. Your packing list stays visible and protected through the transparent face. Ships in convenient cases of 1,000 units with tamper-evident security.
Packing List Envelopes

3x4.5 2 Mil Clear Self-Adhesive Packing List Envelopes 1000/Case

PN: PL470

3 x 4 1/2 in 2 Mil Poly 1000 PER CASE
$35.58 / 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 ->