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 Industrial-grade 20" x 16" x 16" corrugated shipping boxes with ECT-32 kraft construction deliver robust stacking performance and freight efficiency for warehouse operations. Bundle of 15 boxes per pack reduces per-unit costs while maintaining consistent crush strength for medium to heavy items. Recyclable kraft material meets sustainability standards for compliant logistics.
Boxes - Corrugated

20x16x16 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 15-Pack

PN: 201616

20 x 16 x 16 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$47.92 / BUNDLE
IN STOCK Pre-scored multi-depth corrugated boxes that fold to your exact size–no carton sizer required. These 20x16x14 ECT-32 kraft boxes eliminate inventory bloat by replacing 3-5 single-depth cartons with one adjustable solution. Bundle of 20 boxes ships ready to use.
Boxes - Corrugated

20x16x14 ECT-32 Kraft Multi-Depth Corrugated Shipping Boxes 20-Pack

PN: MD201614

20 x 16 x 14 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$57.61 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes engineered for warehouses and fulfillment centers handling mid-weight products. These 20" x 16" x 14" shipping cartons deliver proven stacking performance and crush resistance in an economical bundle of 20. 100% recyclable kraft material reduces environmental impact while maintaining reliable containment.
Boxes - Corrugated

20x16x14 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 201614

20 x 16 x 14 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$54.99 / BUNDLE
IN STOCK Industrial-strength ECT-32 kraft corrugated boxes sized 20" x 16" x 12" for dependable mid-weight shipping and storage. Sold as a bundle of 25 cartons, these single wall cardboard boxes deliver proven stacking performance and cost efficiency for warehouse and fulfillment operations. Recyclable kraft construction.
Boxes - Corrugated

20x16x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 201612

20 x 16 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$70.44 / BUNDLE
IN STOCK 20x16x10 Kraft Corrugated Heavy Duty Shipping Boxes, 425 Pack Pallet, 32 ECT
Boxes - Corrugated

20x16x10 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 25-Pack

PN: 201610

20 x 16 x 10 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$65.58 / BUNDLE
IN STOCK These 20x16x4 shallow-depth corrugated cartons deliver reliable ECT-32 single-wall protection for lightweight to medium-weight items. Ships flat in bundles of 25 to maximize your warehouse space and cut freight costs. Ideal for apparel, books, artwork, and other thin products.
Boxes - Corrugated

20x16x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 20164

20 x 16 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$52.66 / BUNDLE
IN STOCK ECT-32 kraft corrugated moving boxes engineered for warehouse efficiency and freight optimization. 18" × 18" × 16" dimensions with innovative flap tabs that keep packing organized. Bundle of 20 cartons delivers reliable 3.0 cubic-foot capacity per box at maximum stacking performance.
Boxes - Corrugated

18x18x16 ECT-32 Kraft Deluxe Moving Boxes 20-Pack

PN: 181816DPB

18 x 18 x 16 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$79.51 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated shipping boxes in 18" x 18" x 16" dimensions–the industry standard for packing small electronics and medium-weight products. Each bundle contains 20 boxes that ship flat, maximizing your warehouse storage efficiency and reducing inbound freight spend. Rated for reliable stacking performance in distribution and fulfillment operations.
Boxes - Corrugated

18x18x16 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181816

18 x 18 x 16 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$56.67 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes sized 18" x 18" x 15" deliver reliable mid-duty protection for high-volume shipping and warehouse storage. This bundle of 20 kraft cartons offers strong stacking performance and optimal freight efficiency for fulfillment operations. 100% recyclable kraft corrugated construction.
Boxes - Corrugated

18x18x15 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181815

18 x 18 x 15 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$69.13 / BUNDLE
IN STOCK 18x18x14 Kraft Corrugated Shipping Boxes, 360 Pack Pallet, 32 ECT
Boxes - Corrugated

18x18x14 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181814

18 x 18 x 14 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$63.23 / BUNDLE
IN STOCK ECT-48 double wall kraft corrugated boxes built for maximum protection and stacking performance. These 18x18x12 heavy-duty cartons provide the durability warehouse managers and fulfillment directors demand for high-volume shipments. Bundle of 10 ships flat to maximize storage efficiency and minimize freight costs.
Boxes - Corrugated

18x18x12 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD181812DW

18 x 18 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$46.08 / BUNDLE
IN STOCK Pre-scored multi-depth corrugated boxes that fold to your exact size–eliminate carton sizers and redundant SKUs. ECT-32 kraft construction delivers the right strength for your shipments while cutting parcel service costs. Bundle of 20 boxes ready to ship.
Boxes - Corrugated

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

PN: MD181812

18 x 18 x 12 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$60.86 / BUNDLE
IN STOCK 18x18x10 Kraft Corrugated Heavy Duty Shipping Boxes, 400 Pack Pallet, 32 ECT
Boxes - Corrugated

18x18x10 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 20-Pack

PN: 181810

18 x 18 x 10 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$56.40 / BUNDLE
IN STOCK Engineered for high-volume fulfillment operations, these 18x18x8 corrugated boxes deliver ECT-32 single-wall durability in an efficient mid-size format. Perfect for medium-weight products, seasonal storage, and freight optimization. Kraft construction is 100% recyclable–reduce waste while shipping smarter.
Boxes - Corrugated

18x18x8 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18188

18 x 18 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$65.17 / BUNDLE
IN STOCK 18x18x6 Kraft Adjustable Multi-Depth Corrugated Shipping Boxes, 460 Pack Pallet, 32 ECT
Boxes - Corrugated

18x18x6 ECT-32 Kraft Adjustable Multi-Depth Corrugated Shipping Boxes 20-Pack

PN: MD18186

18 x 18 x 6 in ECT-32 Corrugated 20 PER BUNDLE
$49.55 / BUNDLE
IN STOCK Ship smarter with these 18x18x6 shallow-depth corrugated boxes made from ECT-32 kraft material. Bundle of 20 ships flat to save on storage and freight costs. Ideal for electronics, PC components, and compact products that don't need deep cartons.
Boxes - Corrugated

18x18x6 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 18186

18 x 18 x 6 in ECT-32 Corrugated 20 PER BUNDLE
$43.49 / 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 ->