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 40x12x12 Double Wall Corrugated Boxes, 110 Pack Pallet, 48 ECT
Boxes - Corrugated

40x12x12 ECT-48 Double Wall Corrugated Boxes 10-Pack

PN: HD401212DW

40 x 12 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$110.47 / BUNDLE
IN STOCK Professional-grade 28x24x20" corrugated shipping boxes in ECT-32 single-wall kraft construction. Bundle of 10 boxes ships flat to maximize storage efficiency and reduce inbound freight costs. Engineered for reliable stacking performance in high-volume fulfillment operations.
Boxes - Corrugated

28x24x20 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 282420

28 x 24 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$115.53 / BUNDLE
IN STOCK Industrial-grade 26x26x20 double wall corrugated boxes deliver ECT-48 rated strength for demanding warehouses and fulfillment centers. Ships and stores flat to maximize warehouse efficiency–bundle of 10 boxes ready to deploy. Built for high-volume shippers who need reliable stacking performance and freight cost savings.
Boxes - Corrugated

26x26x20 ECT-48 Double Wall Corrugated Boxes 10-Pack

PN: HD262620DW

26 x 26 x 20 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$229.42 / BUNDLE
IN STOCK Heavy-duty 26x26x16 corrugated shipping cartons built with ECT-32 kraft material for reliable stacking and freight efficiency. Each bundle includes 10 boxes–perfect for mid-size shipments in warehouse, fulfillment, and distribution operations. Recyclable kraft construction reduces environmental impact while maintaining maximum load capacity.
Boxes - Corrugated

26x26x16 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 262616

26 x 26 x 16 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$80.69 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 26"x26"x4" deliver optimal protection for shallow products while maximizing warehouse efficiency. This bundle of 15 flat corrugated shipping boxes ships compact, reducing your storage footprint and freight costs. Ideal for apparel, books, frames, and artwork.
Boxes - Corrugated

26x26x4 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 26264

26 x 26 x 4 in ECT-32 Corrugated 15 PER BUNDLE
$76.36 / BUNDLE
IN STOCK Industrial-grade 24x24x28 corrugated shipping boxes built from ECT-32 kraft material for reliable stacking and freight protection. Each bundle contains 10 boxes, optimizing your warehouse inventory and reducing per-unit costs. Fully recyclable kraft construction meets modern sustainability standards while delivering the strength your operation demands.
Boxes - Corrugated

24x24x28 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 242428

24 x 24 x 28 in ECT-32 Corrugated 10 PER BUNDLE
$105.83 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes in 22x22x30 dimensions deliver reliable strength for warehouse, fulfillment, and shipping operations. Kraft construction stacks efficiently and maximizes pallet density. Sold as bundles of 10 for volume savings and freight efficiency.
Boxes - Corrugated

22x22x30 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 222230

22 x 22 x 30 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$90.48 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes designed for shipping tall items like trophies, shelving, and fishing rods. 16x16x36" dimensions provide reliable protection with strong single-wall construction. Sold as a bundle of 10, shipped flat for maximum freight efficiency and storage savings.
Boxes - Corrugated

16x16x36 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 161636

16 x 16 x 36 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$50.67 / BUNDLE
IN STOCK ECT-32 single-wall corrugated lamp boxes sized 12" × 12" × 46" deliver adjustable, custom-fit protection for lamps, mirrors, artwork, and other fragile items. Pre-printed with fragile warnings, "This Side Up" arrows, and write-on destination panels. Sold flat in bundles of 15 for maximum freight efficiency.
Boxes - Corrugated

12x12x46 ECT-32 Kraft Lamp Boxes 15-Pack

PN: INNERLAMP

12 x 12 x 46 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$64.94 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 12" x 12" x 40" deliver exceptional height for tall products and fragile items requiring premium protection. Each bundle includes 15 boxes with end-load design for fast, efficient packing and sealing. Shipped flat to maximize freight efficiency and minimize storage footprint.
Boxes - Corrugated

12x12x40 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 121240

12 x 12 x 40 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$55.61 / BUNDLE
IN STOCK Adjustable two-piece telescoping inner boxes designed for tall and irregularly shaped items. Made from ECT-32 kraft corrugated with full overlap bottoms for maximum stacking strength. Sold as bundle of 15–pair with T12448OUTER to complete your shipping solution.
Boxes - Corrugated

12x4x48 ECT-32 Kraft Telescoping Inner Boxes 15-Pack

PN: T12448INNER

12 x 4 x 48 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$94.56 / BUNDLE
IN STOCK Heavy-duty 4x4x48 corrugated boxes manufactured from ECT-32 kraft material deliver reliable protection for tall, narrow items. End-load design enables fast insertion and sealing, reducing packing labor. Sold in convenient 25-box bundles to maximize volume savings for warehouse managers and fulfillment operations.
Boxes - Corrugated

4x4x48 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 4448

4 x 4 x 48 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$55.41 / BUNDLE
IN STOCK ECT-44 single-wall kraft corrugated boxes in 36x5x42 dimensions–the industry standard for high-volume fulfillment operations. Ships and stores flat to maximize warehouse efficiency. Bundle of 5 reduces per-unit costs and freight overhead.
Boxes - Corrugated

36x5x42 ECT-44 Kraft Side Loading Boxes 5-Pack

PN: 36542FOL

36 x 5 x 42 in ECT-44 Single Wall Corrugated 5 PER BUNDLE
$44.39 / BUNDLE
IN STOCK Heavy-duty 30x6x40 side loading boxes manufactured from ECT-44 kraft corrugated with full overlap flaps for maximum edge protection. End-opening design streamlines product insertion and reduces labor time. Ships flat in bundles of 10 to minimize storage footprint and freight costs.
Boxes - Corrugated

30x6x40 ECT-44 Kraft Side Loading Boxes 10-Pack

PN: HD30640FOL

30 x 6 x 40 in ECT-44 Corrugated 10 PER BUNDLE
$129.01 / BUNDLE
IN STOCK Industrial-grade 26 x 26 x 12" double wall corrugated shipping boxes rated ECT-48 for maximum protection and stacking performance. Manufactured from heavy-duty kraft corrugated material to safeguard high-value shipments across supply chains. Sold in bundles of 10 and shipped flat to maximize warehouse space and reduce freight costs.
Boxes - Corrugated

26x26x12 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD262612DW

26 x 26 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$147.18 / BUNDLE
IN STOCK Adjustable two-piece telescoping outer cartons designed for tall and irregularly shaped items. ECT-32 kraft corrugated with full overlap bottom for maximum stacking strength. Sold as bundle of 25–pair with T4448INNER for complete packaging solution.
Boxes - Corrugated

4.5x4.5x48 ECT-32 Kraft Corrugated Telescoping Outer Box 25-Pack

PN: T4448OUTER

4 1/2 x 4 1/2 x 48 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$67.60 / 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 ->