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 Heavy-duty ECT-48 double wall corrugated boxes built for demanding warehouse and fulfillment operations. 25x25x25 cube dimensions maximize pallet density and reduce freight costs. Ships flat to save 80% storage space–order in bundles of 5.
Boxes - Corrugated

25x25x25 ECT-48 Kraft Heavy Duty Cube Double Wall Corrugated Shipping Box 5-Pack

PN: HD252525DW

25 x 25 x 25 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$92.76 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 24x24x26" dimensions deliver proven stacking strength for warehouse and fulfillment operations. Each bundle contains 10 boxes, optimizing freight efficiency and reducing per-unit costs. Fully recyclable material meets sustainability requirements.
Boxes - Corrugated

24x24x26 ECT-32 Kraft Corrugated Boxes 10-Pack

PN: 242426

24 x 24 x 26 in ECT-32 Corrugated 10 PER BUNDLE
$102.78 / BUNDLE
IN STOCK Ship tall items efficiently with these 15x15x36 corrugated boxes made from sturdy ECT-32 kraft material. End-loading design allows fast insertion and sealing. Bundle of 15 boxes ships flat to maximize freight efficiency and reduce storage footprint.
Boxes - Corrugated

15x15x36 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 151536

15 x 15 x 36 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$87.39 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated boxes in 26x26x20" dimensions deliver industrial-grade strength for demanding warehouse and fulfillment operations. Each bundle of 10 boxes maximizes freight efficiency and stacking performance. Manufactured from 100% recyclable kraft corrugated material–reduce waste while maintaining durability.
Boxes - Corrugated

26x26x20 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 262620

26 x 26 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$73.66 / BUNDLE
IN STOCK Industrial-grade 26x26x14 corrugated boxes rated ECT-32 for reliable stacking and freight performance. This 10-pack bundle of kraft shipping cartons ships and stores flat, maximizing your warehouse space while reducing handling costs. Built tough for repeated use in fulfillment operations.
Boxes - Corrugated

26x26x14 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 262614

26 x 26 x 14 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$92.29 / BUNDLE
IN STOCK Ship long, narrow items with confidence using these 48x4x4 ECT-32 kraft corrugated boxes. Wide openings along the 48" length enable fast, efficient packing of wine bottles, umbrellas, carpet rolls, and similar products. Sold as a 25-box bundle and shipped flat to maximize freight efficiency.
Boxes - Corrugated

48x4x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 4844

48 x 4 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$78.13 / BUNDLE
IN STOCK Ship long, narrow items efficiently with 40x12x12 ECT-32 kraft corrugated boxes featuring wide long-side openings for fast packing. Each bundle includes 15 boxes–ideal for wine bottles, umbrellas, carpet rolls, and specialty items. Reduce wasted space and cut per-unit shipping costs.
Boxes - Corrugated

40x12x12 ECT-32 Kraft Long Corrugated Shipping Boxes 15-Pack

PN: 401212

40 x 12 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$58.16 / BUNDLE
IN STOCK 36x16x16 Kraft Double Wall Corrugated Boxes, 90 Pack Pallet, 48 ECT
Boxes - Corrugated

36x16x16 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD361616DW

36 x 16 x 16 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$131.27 / BUNDLE
IN STOCK Heavy-duty 36x16x16 corrugated shipping boxes rated ECT-32 for reliable stacking and protection of medium-weight industrial shipments. Sold in convenient bundles of 15 kraft cartons, these brown corrugated boxes maximize freight efficiency and reduce per-unit packaging costs. Made from recyclable kraft material–built for warehouse and fulfillment operations.
Boxes - Corrugated

36x16x16 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 361616

36 x 16 x 16 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$74.02 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping boxes sized 36x16x5" deliver optimal performance for shallow products including apparel, books, frames, and artwork. Each bundle of 15 boxes arrives flat, maximizing your warehouse storage footprint while minimizing freight costs on incoming inventory.
Boxes - Corrugated

36x16x5 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 36165

36 x 16 x 5 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$80.62 / BUNDLE
IN STOCK 28x24x6 Kraft Corrugated Shipping Boxes, 250 Pack Pallet, 32 ECT
Boxes - Corrugated

28x24x6 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 28246

28 x 24 x 6 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$45.25 / BUNDLE
IN STOCK Heavy-duty 26x26x12 corrugated boxes built from ECT-32 kraft material deliver reliable protection and maximum stacking strength for high-volume shipping operations. Sold in bundles of 10, these kraft cartons are fully recyclable and engineered for freight efficiency. Perfect for warehouse managers seeking cost-effective, dependable cardboard shipping containers.
Boxes - Corrugated

26x26x12 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 262612

26 x 26 x 12 in ECT-32 Corrugated 10 PER BUNDLE
$52.48 / BUNDLE
IN STOCK Industrial-grade 26x26x10 corrugated shipping boxes built from ECT-32 kraft material for maximum stacking performance and freight reliability. These heavy-duty cardboard boxes deliver superior crush resistance and are sold as a convenient bundle of 10. Perfect for warehouse managers and fulfillment directors demanding consistent quality at scale.
Boxes - Corrugated

26x26x10 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 262610

26 x 26 x 10 in ECT-32 Corrugated 10 PER BUNDLE
$49.76 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 26x26x8" dimensions engineered for shallow product shipping and maximum storage efficiency. These corrugated cartons ship flat in bundles of 10, reducing your warehouse footprint and freight costs while maintaining superior stacking performance for apparel, books, frames, and artwork.
Boxes - Corrugated

26x26x8 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 26268

26 x 26 x 8 in ECT-32 Corrugated 10 PER BUNDLE
$75.23 / BUNDLE
IN STOCK 26x26x6 Kraft Corrugated Shipping Boxes, 230 Pack Pallet, 32 ECT
Boxes - Corrugated

26x26x6 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 26266

26 x 26 x 6 in ECT-32 Corrugated 10 PER BUNDLE
$48.99 / BUNDLE
IN STOCK Adjustable two-piece telescoping inner carton designed for tall and irregularly shaped items up to 48 inches. Built from ECT-32 kraft corrugated with reinforced FOL bottom for maximum stacking strength. Pair with T4448OUTER to complete your shipping solution–25 inner boxes per bundle.
Boxes - Corrugated

4x4x48 ECT-32 Kraft Telescoping Inner Box 25-Pack

PN: T4448INNER

4 x 4 x 48 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.14 / BUNDLE

Product Help Request

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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

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Confirm

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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 ->