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 ECT-32 kraft corrugated boxes in 22x18x10" dimensions deliver reliable stacking performance and protection for mid-sized shipments. Each bundle includes 20 flat-packed cartons that save warehouse storage space while meeting industry standards for freight efficiency. Perfect for fulfillment centers managing high-volume operations.
Boxes - Corrugated

22x18x10 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 221810

22 x 18 x 10 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$97.45 / BUNDLE
IN STOCK Heavy-duty ECT-32 single-wall corrugated cartons sized 22" x 18" x 8" for mid-sized freight loads. Sold as a bundle of 20 kraft boxes, these standard-strength shipping cartons deliver reliable stacking performance and cost-effective volume protection. Recyclable kraft construction built for warehouse operations and fulfillment demands.
Boxes - Corrugated

22x18x8 ECT-32 Kraft Corrugated Cartons 20-Pack

PN: 22188

22 x 18 x 8 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$58.99 / BUNDLE
IN STOCK Optimize your fulfillment with these ECT-32 kraft corrugated boxes in a compact 22" x 18" x 6" shallow depth design. Perfect for apparel, books, frames, and artwork that don't require deep cartons. Ships flat to maximize warehouse storage and cut freight costs–bundle of 20 ready to go.
Boxes - Corrugated

22x18x6 ECT-32 Kraft Corrugated Boxes 20-Pack

PN: 22186

22 x 18 x 6 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$55.77 / BUNDLE
IN STOCK Professional-grade 20x20x18 corrugated boxes built from ECT-32 kraft material deliver reliable stacking strength and freight efficiency for high-volume warehouses. Sold in bundles of 10, these heavy-duty shipping cartons maximize pallet density while maintaining superior crush resistance. Cost-effective, recyclable packaging for fulfillment centers handling mid-to-heavy loads.
Boxes - Corrugated

20x20x18 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 202018

20 x 20 x 18 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$40.59 / BUNDLE
IN STOCK Professional-grade 20x20x16 corrugated shipping boxes manufactured from ECT-32 kraft single-wall material. Bundle of 15 boxes delivers proven stacking performance and freight efficiency for warehouse managers and fulfillment centers. Recyclable cardboard construction reduces disposal costs.
Boxes - Corrugated

20x20x16 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 202016

20 x 20 x 16 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$58.42 / BUNDLE
IN STOCK Professional-grade 20x20x15" corrugated shipping boxes built from ECT-32 single-wall kraft material for reliable stacking and freight efficiency. Each bundle contains 20 boxes–ideal for mid-volume warehouse and fulfillment operations. Recyclable, cost-effective, and engineered to handle standard distribution demands.
Boxes - Corrugated

20x20x15 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 202015

20 x 20 x 15 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$76.59 / BUNDLE
IN STOCK Industrial-grade 20x20x14 corrugated shipping boxes engineered for reliable mid-size product protection. ECT-32 kraft construction delivers proven stacking strength and crush resistance. Bundle of 15 flat-packed cartons ships efficiently, reducing freight costs and warehouse storage footprint.
Boxes - Corrugated

20x20x14 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 202014

20 x 20 x 14 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$58.96 / BUNDLE
IN STOCK Maximize your fulfillment efficiency with these ECT-44 heavy-duty corrugated boxes–40% stronger than standard shipping containers for superior protection and stacking performance. Each 20x20x12 kraft carton is engineered for high-volume operations, sold flat in bundles of 10 to reduce freight costs and storage footprint.
Boxes - Corrugated

20x20x12 ECT-44 Kraft Heavy-Duty Corrugated Shipping Boxes 10-Pack

PN: HD202012

20 x 20 x 12 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$50.43 / BUNDLE
IN STOCK Reduce SKU complexity and cut parcel shipping costs with these pre-scored 20x20x12 corrugated boxes. Fold to 4", 6", 8", or 12" heights–no carton sizer needed. ECT-32 kraft construction delivers reliable stacking strength while consolidating multiple box sizes into one inventory item. Sold in bundles of 15.
Boxes - Corrugated

20x20x12 ECT-32 Kraft Adjustable Multi-Depth Corrugated Shipping Boxes 15-Pack

PN: MD202012

20 x 20 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$61.55 / BUNDLE
IN STOCK Standard-strength ECT-32 kraft corrugated boxes sized 20" x 20" x 12" for reliable PC tower and mid-size product shipping. Bundle of 15 ships flat for maximum freight efficiency and storage savings. Proven performance for warehouse, fulfillment, and e-commerce operations.
Boxes - Corrugated

20x20x12 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 202012

20 x 20 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$46.29 / BUNDLE
IN STOCK Industrial-grade 20x20x11 corrugated shipping boxes built from ECT-32 kraft material for reliable stacking and freight efficiency. This bundle includes 15 boxes–the standard choice for warehouse managers and fulfillment operations seeking cost-effective, recyclable packaging solutions without compromising durability.
Boxes - Corrugated

20x20x11 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 202011

20 x 20 x 11 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$55.91 / BUNDLE
IN STOCK Ship shallow products efficiently with these 20x20x8" ECT-32 kraft corrugated boxes. Bundle of 15 units ships flat to maximize storage and reduce freight costs. Ideal for apparel, books, artwork, and picture frames–all the protection you need without excess depth.
Boxes - Corrugated

20x20x8 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 20208

20 x 20 x 8 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$46.88 / BUNDLE
IN STOCK Ship shallow products efficiently with these 20x20x7 kraft corrugated boxes rated ECT-32 single wall construction. Ideal for apparel, books, frames, and artwork, this bundle of 15 arrives flat to minimize storage footprint and reduce inbound freight spend.
Boxes - Corrugated

20x20x7 ECT-32 Kraft Corrugated Shipping Boxes Single Wall 15-Pack

PN: 20207

20 x 20 x 7 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$67.36 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 20" × 20" × 6" deliver reliable single-wall protection for lightweight to mid-weight products. The shallow 6" depth minimizes dimensional weight charges and maximizes pallet density, reducing your per-unit freight costs. Ships flat in bundles of 15 to maximize your warehouse efficiency.
Boxes - Corrugated

20x20x6 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 20206

20 x 20 x 6 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$40.40 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 20x20x4" dimensions designed for shallow-depth products that require secure, stackable shipping. Ships flat in bundles of 10 to maximize storage efficiency and reduce freight costs. Ideal for apparel, books, picture frames, artwork, and mirrors.
Boxes - Corrugated

20x20x4 ECT-32 Kraft Corrugated Boxes 10-Pack

PN: 20204

20 x 20 x 4 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$26.06 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 20x20x2" dimensions–engineered for shallow products like apparel, books, and artwork. Ships flat in bundles of 20 to maximize storage efficiency and reduce freight costs. Reliable single-wall construction delivers proven stacking performance.
Boxes - Corrugated

20x20x2 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 20202

20 x 20 x 2 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$88.01 / BUNDLE

Product Help Request

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Buying path

Buy Boxes & Mailers by the specs that change the order

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Compare

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Reorder

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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 ->