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 Ship tall items efficiently with our 4x4x36 corrugated boxes–ECT-32 kraft single wall construction delivers proven strength at competitive bulk pricing. End-loading design speeds packing operations. Bundle of 25 ships flat to maximize freight efficiency.
Boxes - Corrugated

4x4x36 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 4436

4 x 4 x 36 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$40.68 / BUNDLE
IN STOCK Ship long and narrow items efficiently with our 32x8x8 ECT-32 kraft corrugated boxes. Wide lengthwise opening speeds packing for wine bottles, umbrellas, carpet rolls, and similar products. Sold and shipped flat in bundles of 25 for maximum freight efficiency and volume savings.
Boxes - Corrugated

32x8x8 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 3288

32 x 8 x 8 in ECT-32 Corrugated 25 PER BUNDLE
$44.63 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes sized 28" x 12" x 8" deliver reliable stacking strength for medium-weight shipments and storage. Ships and stores flat to reduce your warehouse footprint and freight costs. Sold in bundles of 25–ready to stock your fulfillment operation.
Boxes - Corrugated

28x12x8 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 28128

28 x 12 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$89.51 / BUNDLE
IN STOCK Industrial-grade ECT-48 double wall corrugated boxes designed for warehouse and fulfillment operations requiring maximum protection and stacking performance. These 24 x 16 x 16" kraft cartons feature superior burst strength and arrive flat for efficient storage and freight savings. Ships as a bundle of 10 units.
Boxes - Corrugated

24x16x16 ECT-48 Kraft Double Wall Corrugated Shipping Boxes 10-Pack

PN: HD241616DW

24 x 16 x 16 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$56.06 / BUNDLE
IN STOCK ECT-48 kraft double wall corrugated boxes engineered for maximum protection and stacking performance. These 24" x 16" x 12" shipping cartons deliver superior strength for fragile, heavy, or multi-SKU shipments. Sold in bundles of 10 and ship flat to minimize storage footprint and freight costs.
Boxes - Corrugated

24x16x12 ECT-48 Kraft Heavy-Duty Double Wall Corrugated Shipping Boxes 10-Pack

PN: HD241612DW

24 x 16 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$76.82 / BUNDLE
IN STOCK Industrial-grade ECT-48 double wall corrugated boxes engineered for maximum protection and stacking performance. Each bundle includes 15 flat-shipped kraft cartons, reducing your storage footprint and freight costs while guaranteeing damage-free delivery of mid-weight to heavy merchandise.
Boxes - Corrugated

24x16x8 ECT-48 Double Wall Corrugated Boxes 15-Pack

PN: HD24168DW

24 x 16 x 8 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$102.70 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 24" x 16" x 6" dimensions–engineered for shallow product shipping with excellent stacking strength. Sold in bundles of 20 and ship flat to maximize storage efficiency and reduce inbound freight costs. Ideal for apparel, books, artwork, and picture frames.
Boxes - Corrugated

24x16x6 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 24166

24 x 16 x 6 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$48.96 / BUNDLE
IN STOCK Efficient 22x18x4 corrugated shipping boxes in ECT-32 kraft material designed for shallow merchandise and compact freight optimization. Bundle of 25 boxes ships flat to maximize your warehouse storage and reduce dimensional freight charges. Ideal for apparel, books, frames, and artwork shipments.
Boxes - Corrugated

22x18x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 22184

22 x 18 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$96.35 / BUNDLE
IN STOCK Heavy-duty ECT-44 single wall corrugated boxes built 40% stronger than standard shipping containers for superior stacking performance and load-bearing capacity. These 20x20x20" kraft cartons ship flat and bundle in quantities of 10, maximizing warehouse efficiency and freight savings. Trusted by fulfillment directors for demanding distribution environments.
Boxes - Corrugated

20x20x20 ECT-44 Kraft Heavy-Duty Corrugated Shipping Boxes 10-Pack

PN: HD202020

20 x 20 x 20 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$60.58 / BUNDLE
IN STOCK Reduce carton inventory and cut shipping costs with these 20x20x20 multi-depth corrugated boxes. Pre-scored kraft cardboard adjusts to multiple heights–no carton sizer needed. ECT-32 single wall construction delivers strength and reliability. Sold as a bundle of 10.
Boxes - Corrugated

20x20x20 ECT-32 Kraft Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MD202020

20 x 20 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$47.66 / BUNDLE
IN STOCK 20x20x20 Kraft Corrugated Cube Shipping Box, 290 Pack Pallet, 32 ECT
Boxes - Corrugated

20x20x20 ECT-32 Kraft Corrugated Cube Shipping Box 10-Pack

PN: 202020

20 x 20 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$38.72 / BUNDLE
IN STOCK Heavy-duty ECT-48 double wall corrugated boxes engineered for maximum protection and stacking performance. Each bundle includes 10 kraft cartons (20" x 20" x 16") that ship flat to reduce your storage footprint and freight costs. Ideal for fulfillment centers and warehouse managers shipping mid-weight to heavy products.
Boxes - Corrugated

20x20x16 ECT-48 Double Wall Corrugated Shipping Boxes 10-Pack

PN: HD202016DW

20 x 20 x 16 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$67.47 / BUNDLE
IN STOCK Industrial-grade ECT-48 double wall corrugated boxes with built-in hand holes for efficient warehouse handling. 20" x 20" x 12" kraft cartons ship flat to maximize storage, stack reliably under load, and reduce freight costs. Sold as a bundle of 10 boxes.
Boxes - Corrugated

20x20x12 ECT-48 Double Wall Hand Hole Box 10-Pack

PN: HD202012DWHH

20 x 20 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$77.35 / BUNDLE
IN STOCK Heavy-duty ECT-48 double wall corrugated cartons engineered for maximum protection and stacking performance. Each 20" x 20" x 12" shipping box handles demanding warehouse conditions without compromise. Bundle of 10 units ships flat–save storage space and freight costs.
Boxes - Corrugated

20x20x12 ECT-48 Kraft Double Wall Corrugated Shipping Boxes 10-Pack

PN: HD202012DW

20 x 20 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$56.89 / BUNDLE
IN STOCK Protect high-value shipments with ECT-48 double wall corrugated construction rated for maximum stacking performance. These 20x20x10 kraft boxes deliver industrial-grade durability for warehouse, fulfillment, and logistics operations. Ships flat in bundles of 10 to maximize storage efficiency and reduce freight costs.
Boxes - Corrugated

20x20x10 ECT-48 Double Wall Corrugated Boxes 10-Pack

PN: HD202010DW

20 x 20 x 10 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$72.82 / BUNDLE
IN STOCK 10x10x30" Tall Corrugated Boxes ECT-32 Kraft - Bundle of 25
Boxes - Corrugated

10x10x30 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 101030

10 x 10 x 30 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$77.34 / BUNDLE

Product Help Request

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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.

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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 ->