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 24x24x18" deluxe packing boxes manufactured from ECT-32 single-wall kraft corrugated with reinforced flap tabs that hold securely during handling and stacking. Each box delivers 6.0 cubic feet of capacity with reliable crush resistance–sold as a bundle of 10 to maximize freight efficiency and reduce per-unit costs.
Boxes - Corrugated

24x24x18 ECT-32 Kraft Deluxe Moving Boxes 10-Pack

PN: 242418DPB

24 x 24 x 18 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$74.99 / BUNDLE
IN STOCK Ship long and narrow items efficiently with 40x8x8 corrugated boxes featuring wide lengthwise openings for fast, hassle-free packing. Made from sturdy ECT-32 kraft material, these long boxes stack efficiently and reduce freight costs. Sold flat in bundles of 25 for maximum storage space.
Boxes - Corrugated

40x8x8 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 4088

40 x 8 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$66.15 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 36x12x12 dimensions–engineered for long, narrow items like wine bottles, carpet rolls, and umbrellas. The extended length minimizes excess packaging material while the wide lengthwise opening accelerates packing speed. Sold in bundles of 15, flat-shipped to save your warehouse space.
Boxes - Corrugated

36x12x12 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 361212

36 x 12 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$49.25 / BUNDLE
IN STOCK Ship long, narrow items efficiently with these 36x12x10 corrugated cartons featuring a convenient long side opening for fast packing. ECT-32 single wall kraft construction delivers reliable protection while maximizing freight efficiency. Sold as a bundle of 15 boxes, flat-shipped to save warehouse space.
Boxes - Corrugated

36x12x10 ECT-32 Kraft Corrugated Long Shipping Boxes 15-Pack

PN: 361210

36 x 12 x 10 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$46.09 / BUNDLE
IN STOCK Engineered for high-volume fulfillment operations, these 36x12x8 ECT-32 kraft corrugated boxes deliver proven stacking strength and cost efficiency. Ship flat to maximize warehouse space and reduce freight overhead. Bundle of 20 boxes provides immediate inventory ready to pack and protect your products.
Boxes - Corrugated

36x12x8 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 36128

36 x 12 x 8 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$98.37 / BUNDLE
IN STOCK Ship shallow products efficiently with these 36x12x6 ECT-32 kraft corrugated boxes. Ideal depth minimizes void fill and maximizes pallet stacking for apparel, books, artwork, and framed items. Sold flat in bundles of 20 to reduce storage footprint and freight costs.
Boxes - Corrugated

36x12x6 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 36126

36 x 12 x 6 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$79.38 / BUNDLE
IN STOCK Ship shallow products efficiently with these 36" x 12" x 4" ECT-32 kraft corrugated boxes. Engineered for apparel, books, artwork, and framed items, they stack reliably and ship flat to maximize your warehouse storage. Bundle of 20 boxes per carton.
Boxes - Corrugated

36x12x4 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 36124

36 x 12 x 4 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$57.55 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated boxes sized 30" × 18" × 18" for standard industrial shipping and storage. Sold as a convenient 10-box bundle to maximize your freight efficiency and reduce per-unit cost. Recyclable cardboard construction meets reliable stacking performance.
Boxes - Corrugated

30x18x18 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 301818

30 x 18 x 18 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$49.03 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 30" x 18" x 16" deliver industry-standard strength for high-volume shipping and storage. Ships flat in bundles of 15 to maximize warehouse space and reduce freight costs. Perfect for mid-size fulfillment operations handling medium-weight products.
Boxes - Corrugated

30x18x16 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 301816

30 x 18 x 16 in ECT-32 Corrugated 15 PER BUNDLE
$111.39 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 28" x 20" x 25" deliver reliable single-wall protection for mid-weight industrial shipments and warehouse storage. Sold in bundles of 10 with superior stacking performance and freight efficiency. Fully recyclable construction built for repeated handling.
Boxes - Corrugated

28x20x25 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 10-Pack

PN: 282025

28 x 20 x 25 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$64.33 / BUNDLE
IN STOCK Heavy-duty ECT-32 corrugated boxes built for demanding warehouse operations. 24" x 24" x 22" kraft construction delivers proven stacking performance and freight efficiency. Sold as a bundle of 10 to maximize your per-unit savings.
Boxes - Corrugated

24x24x22 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 242422

24 x 24 x 22 in ECT-32 Corrugated 10 PER BUNDLE
$82.64 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 24" × 24" × 20" for reliable mid-weight shipping and storage. Sold in bundles of 10 to maximize freight efficiency and reduce per-unit cost. Tested stacking performance and recyclable material ideal for fulfillment operations.
Boxes - Corrugated

24x24x20 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 242420

24 x 24 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$63.77 / BUNDLE
IN STOCK Heavy-duty 24x24x16 corrugated shipping boxes built from ECT-32 kraft material for maximum stacking performance and freight efficiency. Bundle of 10 boxes delivers reliable protection for mid-size shipments. Recyclable, cost-effective solution for warehouse and fulfillment operations.
Boxes - Corrugated

24x24x16 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 242416

24 x 24 x 16 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$53.04 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes measuring 24"W × 24"D × 14"H, sold as a bundle of 10 units. Built for reliable stacking performance and freight efficiency in high-volume fulfillment environments. Standard-strength single-wall construction delivers cost-effective shipping protection for mid-weight products.
Boxes - Corrugated

24x24x14 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 242414

24 x 24 x 14 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$49.50 / BUNDLE
IN STOCK Heavy-duty ECT-44 single wall kraft corrugated boxes engineered for maximum stacking strength and freight protection. These 24x24x12 shipping cartons deliver 40% greater strength than standard containers, reducing damage claims and improving warehouse efficiency. Sold flat in bundles of 10 for easy storage and fast deployment.
Boxes - Corrugated

24x24x12 ECT-44 Kraft Heavy-Duty Corrugated Shipping Boxes 10-Pack

PN: HD242412

24 x 24 x 12 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$65.47 / BUNDLE
IN STOCK These 24x24x12 multi-depth corrugated boxes fold to your exact size with pre-scored sides–no carton sizer required. Made from durable ECT-32 kraft material and sold as a bundle of 10, they reduce inventory complexity while maximizing freight efficiency and parcel service savings.
Boxes - Corrugated

24x24x12 ECT-32 Adjustable Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MD242412

24 x 24 x 12 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$46.73 / 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 ->