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 sized 36" × 24" × 20" deliver reliable stacking performance and freight efficiency for high-volume shipping operations. Sold in bundles of 5, these standard-strength cardboard shipping boxes are engineered to protect mid-to-heavy goods while optimizing pallet utilization. Recyclable kraft construction reduces environmental footprint without compromising durability.
Boxes - Corrugated

36x24x20 ECT-32 Kraft Corrugated Shipping Boxes 5-Pack

PN: 362420

36 x 24 x 20 in ECT-32 Single Wall Corrugated 5 PER BUNDLE
$38.36 / BUNDLE
IN STOCK ECT-48 double wall corrugated boxes built for high-performance industrial shipping. 36" × 24" × 12" kraft construction delivers maximum stacking strength and impact resistance. Ships flat in bundles of 5 to reduce storage footprint and freight costs.
Boxes - Corrugated

36x24x12 ECT-48 Double Wall Corrugated Shipping Boxes 5-Pack

PN: HD362412DW

36 x 24 x 12 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$57.98 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall corrugated boxes built for demanding warehouse and fulfillment operations. These 36x24x8 kraft cartons deliver maximum stacking performance and freight efficiency while shipping flat to minimize storage overhead. Bundle of 10 units.
Boxes - Corrugated

36x24x8 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD36248DW

36 x 24 x 8 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$153.19 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping cartons sized 36" x 24" x 8" for optimal fit with shallow products. Bundle of 10 ships flat to maximize warehouse efficiency and minimize freight expenses. Ideal for apparel, books, frames, artwork, and retail merchandise.
Boxes - Corrugated

36x24x8 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 36248

36 x 24 x 8 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$81.50 / BUNDLE
IN STOCK Ship smarter with 36x24x6 ECT-32 kraft corrugated boxes–engineered for shallow products like apparel, books, artwork, and frames. Ships flat to maximize your warehouse storage and reduce freight costs. Bundle of 10 boxes.
Boxes - Corrugated

36x24x6 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 36246

36 x 24 x 6 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$55.14 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 36x24x4" dimensions engineered for shallow-depth products like apparel, books, and artwork. Ships flat in bundles of 10 to maximize your storage footprint and reduce inbound freight costs. Reliable single-wall construction rated for standard handling and stacking.
Boxes - Corrugated

36x24x4 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 36244

36 x 24 x 4 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$54.87 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall corrugated boxes designed for demanding warehouse and fulfillment operations. 30" x 30" x 16" dimensions deliver maximum cubic capacity with superior stacking performance and crush resistance. Ships flat in bundles of 5 to minimize storage footprint and freight costs.
Boxes - Corrugated

30x30x16 ECT-48 Double Wall Corrugated Boxes 5-Pack

PN: HD303016DW

30 x 30 x 16 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$83.58 / BUNDLE
IN STOCK Heavy-duty 30" x 30" x 16" corrugated shipping boxes built from ECT-32 kraft material for reliable stacking and freight optimization. Each bundle contains 10 boxes–the standard-strength solution for mid-size fulfillment operations. Recyclable kraft construction reduces waste while delivering proven containment performance.
Boxes - Corrugated

30x30x16 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 303016

30 x 30 x 16 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$79.28 / BUNDLE
IN STOCK Professional-grade 24 x 24 x 36" corrugated shipping boxes with ECT-32 kraft construction deliver reliable protection for mid-size shipments and warehouse storage. Sold as a convenient bundle of 5 boxes, these kraft cartons offer excellent stacking strength and freight efficiency. Recyclable cardboard construction reduces waste while maintaining durability for demanding fulfillment operations.
Boxes - Corrugated

24x24x36 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 5-Pack

PN: 242436

24 x 24 x 36 in ECT-32 Single Wall Corrugated 5 PER BUNDLE
$47.80 / BUNDLE
IN STOCK Ship and store efficiently with these 14x4x52 side loading corrugated boxes featuring ECT-32 single-wall construction. Full overlap (FOL) design ships flat to maximize warehouse space. Bundle of 15 boxes reduces per-unit cost and streamlines your fulfillment operation.
Boxes - Corrugated

14x4x52 ECT-32 Full Overlap FOL Side Loading Boxes 15-Pack

PN: 14452FOL

14 x 4 x 52 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$106.86 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 12" × 12" × 48" deliver 4.0 cubic feet of capacity per box, ideal for tall, narrow shipments and storage. End-loading design speeds packing and sealing operations. Sold as bundle of 15, flat-packed to maximize freight efficiency and minimize warehouse footprint.
Boxes - Corrugated

12x12x48 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 121248

12 x 12 x 48 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$89.30 / BUNDLE
IN STOCK ECT-32 rated 8x4x52" full overlap side loading boxes designed for tall, lightweight shipments. Bundle of 15 kraft corrugated cartons ships and stores flat to maximize warehouse efficiency. Industry-standard FOL design reduces damage while optimizing freight costs.
Boxes - Corrugated

8x4x52 ECT-32 Kraft Full Overlap FOL Side Loading Box 15-Pack

PN: 8452FOL

8 x 4 x 52 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$66.07 / BUNDLE
IN STOCK Industrial-grade 36x24x18 double wall corrugated cartons rated ECT-48 kraft for maximum protection and stacking performance. Built for high-volume shipping, these heavy-duty boxes arrive flat in bundles of 5, reducing your storage footprint and freight costs. Trust tested construction that keeps shipments secure every time.
Boxes - Corrugated

36x24x18 ECT-48 Double Wall Corrugated Boxes 5-Pack

PN: HD362418DW

36 x 24 x 18 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$102.63 / BUNDLE
IN STOCK Adjustable two-piece telescoping outer boxes sized 20.5" x 20.5" x 40" for tall, irregular items. Engineered from ECT-32 single-wall kraft corrugated with full overlap bottom for maximum stacking strength. Sold as a bundle of 10 outer cartons–pair with T202040INNER to complete the system.
Boxes - Corrugated

20.5x20.5x40 ECT-32 Kraft Telescoping Outer Boxes 10-Pack

PN: T202040OUTER

20 1/2 x 20 1/2 x 40 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$105.43 / BUNDLE
IN STOCK Ship tall items with confidence using these 20×20×40" ECT-32 kraft corrugated boxes. Heavy-duty single-wall construction handles trophies, shelving, fishing rods, and more. Each bundle of 10 boxes ships flat for maximum freight efficiency and storage savings.
Boxes - Corrugated

20x20x40 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 202040

20 x 20 x 40 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$97.48 / BUNDLE
IN STOCK Ship tall and irregularly shaped items with confidence using these ECT-32 kraft telescoping boxes. The adjustable two-piece design eliminates wasted space while the full overlap bottom delivers superior stacking strength. Bundle of 15 outers–pair with T121248INNER cartons for complete protection.
Boxes - Corrugated

12.5x12.5x48 ECT-32 Kraft Telescoping Corrugated Boxes 15-Pack

PN: T121248OUTER

12 1/2 x 12 1/2 x 48 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$110.74 / BUNDLE

Product Help Request

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Buying path

Buy Boxes & Mailers by the specs that change the order

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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 ->