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 21x14x14 Kraft Corrugated Shipping Boxes, 420 Pack Pallet, 32 ECT
Boxes - Corrugated

21x14x14 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 211414

21 x 14 x 14 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$54.31 / BUNDLE
IN STOCK Heavy-duty 21x14x10 corrugated boxes engineered for high-volume shipping and storage. ECT-32 kraft construction delivers superior stacking strength and crush resistance. Buy by the bundle of 20 and reduce per-unit costs while maximizing freight efficiency.
Boxes - Corrugated

21x14x10 ECT-32 Kraft Corrugated Boxes 20-Pack

PN: 211410

21 x 14 x 10 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$46.43 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes sized 20" × 15" × 15" deliver standard industrial strength for mid-range shipping and storage applications. Sold as a bundle of 20 units with excellent stacking performance and freight efficiency. Recyclable kraft construction reduces packaging waste while maintaining reliable box integrity.
Boxes - Corrugated

20x15x15 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 201515

20 x 15 x 15 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$55.27 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping boxes sized 20" × 15" × 12" for mid-weight product distribution. Each 25-pack bundle delivers reliable stacking performance and freight efficiency for warehouse operations. Recyclable kraft construction meets standard industrial packaging requirements.
Boxes - Corrugated

20x15x12 ECT-32 Kraft Corrugated Boxes 25-Pack

PN: 201512

20 x 15 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$65.50 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated boxes sized 20" × 15" × 9" for mid-weight product shipping and storage. Bundle of 25 provides reliable stacking strength and efficient pallet utilization. Recyclable kraft construction reduces environmental impact while maintaining superior durability.
Boxes - Corrugated

20x15x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 20159

20 x 15 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.15 / BUNDLE
IN STOCK Maximize freight efficiency with these 20x15x6" shallow-depth corrugated boxes manufactured from durable ECT-32 kraft material. Ship flat to reduce storage footprint and cut per-unit shipping costs. Bundle of 25 boxes designed for apparel, books, artwork, and lightweight products.
Boxes - Corrugated

20x15x6 ECT-32 Kraft Corrugated Boxes 25-Pack

PN: 20156

20 x 15 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$54.57 / BUNDLE
IN STOCK ECT-48 double wall corrugated boxes built for heavy loads and repeated handling. These 16" x 16" x 18" kraft cartons deliver industry-standard crush strength and stacking performance. Ships flat to maximize warehouse storage–bundle of 15 boxes.
Boxes - Corrugated

16x16x18 ECT-48 Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD161618DW

16 x 16 x 18 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$107.35 / BUNDLE
IN STOCK 20x15x10 Kraft Corrugated Shipping Boxes, 480 Pack Pallet, 32 ECT
Boxes - Corrugated

20x15x10 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 201510

20 x 15 x 10 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$47.79 / BUNDLE
IN STOCK Ship and store with confidence using these 15x15x20 corrugated boxes built from ECT-32 kraft material. Each bundle contains 25 boxes ideal for mid-weight products, offering reliable stacking strength and freight efficiency. Recyclable kraft construction reduces your environmental footprint while keeping costs down.
Boxes - Corrugated

15x15x20 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 151520

15 x 15 x 20 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$73.34 / BUNDLE
IN STOCK Ship tall items efficiently with 6x6x29 corrugated boxes featuring ECT-32 kraft construction and end-load design for quick insertion and sealing. This 25-pack bundle of tall cardboard boxes ships flat to maximize freight efficiency and minimize storage footprint. Ideal replacement for mailing tubes when shipping trophies, fishing rods, shelving, and other elongated products.
Boxes - Corrugated

6x6x29 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 6629

6 x 6 x 29 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$64.32 / BUNDLE
IN STOCK Ship and store flat to cut your warehouse footprint in half. These 18x18x3" ECT-32 kraft corrugated boxes deliver industry-standard stacking strength while reducing freight costs. Each bundle of 25 gives you reliable, cost-effective packaging ready to run.
Boxes - Corrugated

18x18x3 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18183

18 x 18 x 3 in ECT-32 Corrugated 25 PER BUNDLE
$82.13 / BUNDLE
IN STOCK Reliable ECT-32 kraft corrugated boxes sized 16" × 16" × 19" for standard-duty shipping and storage applications. Each bundle includes 25 cartons, reducing per-unit costs and simplifying reorder logistics. Kraft construction ensures full recyclability and warehouse-friendly handling.
Boxes - Corrugated

16x16x19 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 161619

16 x 16 x 19 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$83.11 / BUNDLE
IN STOCK Ideal for fulfillment operations shipping shallow products, these 22" x 14" x 4" ECT-32 kraft corrugated cartons deliver reliable protection for apparel, books, frames, and artwork. Each 25-box bundle ships flat to maximize warehouse storage efficiency and reduce freight costs. ECT-32 single-wall construction provides proven stacking performance and durability.
Boxes - Corrugated

22x14x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 22144

22 x 14 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$72.94 / BUNDLE
IN STOCK Professional-grade 20x16x14" heavy-duty corrugated boxes engineered for maximum protection and stacking strength. ECT-44 single wall kraft construction delivers 40% greater durability than standard shipping cartons. Sold flat in convenient bundles of 15 to reduce storage footprint and freight costs.
Boxes - Corrugated

20x16x14 ECT-44 Kraft Heavy-Duty Corrugated Shipping Boxes 15-Pack

PN: HD201614

20 x 16 x 14 in ECT-44 Single Wall Corrugated 15 PER BUNDLE
$57.30 / BUNDLE
IN STOCK Heavy-duty ECT-32-B kraft corrugated boxes sized 20" × 16" × 9"–the industry standard for mid-weight shipping and warehouse storage. Ships flat to maximize freight efficiency and storage density. Bundle of 25 boxes ready to deploy.
Boxes - Corrugated

20x16x9 ECT-32 Kraft -B Corrugated Shipping Boxes 25-Pack

PN: 20169

20 x 16 x 9 in ECT-32-B Corrugated 25 PER BUNDLE
$99.95 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes in 18" x 18" x 12" dimensions, sold as a bundle of 20 units and shipped flat to maximize freight efficiency. Engineered for mid-weight industrial shipments including electronics, monitors, and packaged goods. Kraft construction delivers reliable stacking performance and cost-effective protection for your fulfillment operations.
Boxes - Corrugated

18x18x12 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181812

18 x 18 x 12 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$51.90 / BUNDLE

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

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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 ->