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 10.5x10.5x48" Telescoping Outer Box ECT-32 Kraft - 20-Pack Bundle
Boxes - Corrugated

10.5x10.5x48 ECT-32 Kraft Telescoping Outer Box 20-Pack

PN: T101048OUTER

10 1/2 x 10 1/2 x 48 in ECT-32 Corrugated 20 PER BUNDLE
$111.20 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping cartons designed for reliable performance in high-volume fulfillment operations. These 36x24x18 boxes deliver proven stacking strength and freight efficiency, sold in bundles of 10 for bulk cost savings. Ideal for warehouse managers seeking dependable, recyclable corrugated packaging solutions.
Boxes - Corrugated

36x24x18 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 362418

36 x 24 x 18 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$104.48 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 30" x 30" x 12" for high-volume warehouse and fulfillment operations. Sold in bundles of 10 units. Built for stacking strength and freight efficiency with reliable single-wall construction.
Boxes - Corrugated

30x30x12 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 303012

30 x 30 x 12 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$89.58 / BUNDLE
IN STOCK Ship long, narrow items efficiently with these 48x12x12" corrugated boxes featuring a convenient long side opening for fast packing. ECT-32 kraft construction provides reliable protection for wine bottles, umbrellas, carpet rolls, and similar products. Sold in bundles of 10–order flat and assemble on-demand to maximize warehouse space.
Boxes - Corrugated

48x12x12 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 481212

48 x 12 x 12 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$43.59 / BUNDLE
IN STOCK 48x12x6 Kraft Corrugated Shipping Boxes, 200 Pack Pallet, 32 ECT
Boxes - Corrugated

48x12x6 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 48126

48 x 12 x 6 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$111.00 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 40x20x20" dimensions–the industry standard for mid-weight shipping and storage. Bundle of 10 ships flat to maximize warehouse efficiency and reduce freight costs. Perfect for fulfillment centers managing high-volume orders.
Boxes - Corrugated

40x20x20 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 402020

40 x 20 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$121.05 / BUNDLE
IN STOCK Heavy-duty 36x24x24 corrugated shipping boxes built from ECT-32 kraft material for reliable protection and optimal stacking performance. Each bundle includes 5 boxes, reducing per-unit costs for warehouse managers and fulfillment operations. Recyclable construction supports sustainable logistics without sacrificing strength.
Boxes - Corrugated

36x24x24 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 5-Pack

PN: 362424

36 x 24 x 24 in ECT-32 Single Wall Corrugated 5 PER BUNDLE
$41.46 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes in 36x24x12" dimensions deliver reliable strength for warehouse and fulfillment operations. Each bundle of 10 kraft cartons is built to stack, ship, and perform under standard industrial loads. Recyclable material cuts costs without compromising durability.
Boxes - Corrugated

36x24x12 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 362412

36 x 24 x 12 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$62.45 / BUNDLE
IN STOCK Heavy-duty 36x24x10 corrugated boxes with ECT-32 kraft construction deliver proven stacking performance and freight efficiency for demanding warehouse environments. Perfect for mid-size product shipments, these single-wall cartons maximize cube utilization while maintaining structural integrity. Sold as a bundle of 10–reduce cost per unit while ensuring consistent packaging across your fulfillment operation.
Boxes - Corrugated

36x24x10 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 362410

36 x 24 x 10 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$98.19 / BUNDLE
IN STOCK Heavy-duty ECT-48 kraft double wall cartons engineered for maximum protection and stacking performance. 30" × 30" × 12" dimensions optimize pallet loads and freight costs. Ships flat in bundles of 5–save storage space and reduce inbound shipping.
Boxes - Corrugated

30x30x12 ECT-48 Kraft Double Wall Corrugated Boxes 5-Pack

PN: HD303012DW

30 x 30 x 12 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$78.74 / BUNDLE
IN STOCK Heavy-duty 30x30x10 corrugated boxes built from ECT-32 kraft material deliver consistent stacking performance for high-volume fulfillment operations. Each 15-pack bundle maximizes freight efficiency while reducing per-unit costs. Ideal for warehouses and 3PLs shipping mid-size products with confidence.
Boxes - Corrugated

30x30x10 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 303010

30 x 30 x 10 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$112.42 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 30" × 30" × 8" for efficient shipping of shallow products like apparel, books, and artwork. These flat corrugated cartons arrive pre-bundled (10 per pack) and ship flat to maximize warehouse storage and reduce freight costs. Durable single-wall construction rated for reliable stacking performance.
Boxes - Corrugated

30x30x8 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 30308

30 x 30 x 8 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$66.90 / BUNDLE
IN STOCK These 30x30x6 corrugated cartons feature ECT-32 kraft construction and ship flat to maximize warehouse storage efficiency. Ideal for apparel, books, picture frames, and artwork requiring shallow-depth packaging. Bundle of 15 flat boxes reduces per-unit cost and freight overhead.
Boxes - Corrugated

30x30x6 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 30306

30 x 30 x 6 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$113.30 / BUNDLE
IN STOCK Adjustable two-piece telescoping inner cartons sized 20x20x40 inches–perfect for tall, oversized, and irregularly shaped shipments. Manufactured from durable ECT-32 kraft corrugated with full overlap bottom reinforcement for maximum stacking strength. Sold as bundle of 10; pair with T202040OUTER to complete your shipping set.
Boxes - Corrugated

20x20x40 ECT-32 Kraft Telescoping Inner Boxes 10-Pack

PN: T202040INNER

20 x 20 x 40 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$94.04 / BUNDLE
IN STOCK Adjustable two-piece telescoping inner boxes sized 12x12x48" in ECT-32 kraft corrugated for maximum flexibility with tall and irregularly shaped items. Features a full overlap (FOL) bottom for superior stacking strength and durability. Sold as a bundle of 15–pair with T121248OUTER for complete shipping protection.
Boxes - Corrugated

12x12x48 ECT-32 Kraft Telescoping Inner Boxes 15-Pack

PN: T121248INNER

12 x 12 x 48 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$105.73 / BUNDLE
IN STOCK Heavy-duty ECT-48 kraft double wall boxes deliver superior protection and stacking performance for demanding warehouse operations. These 40x20x20 corrugated cartons combine maximum crush resistance with efficient flat-ship storage. Bundle of 5 units reduces your per-box cost and freight overhead.
Boxes - Corrugated

40x20x20 ECT-48 Double Wall Corrugated Boxes 5-Pack

PN: HD402020DW

40 x 20 x 20 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$83.72 / 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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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 ->