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 cartons deliver superior protection and stacking performance for demanding fulfillment operations. These 18x14x10 kraft shipping boxes combine industrial-grade strength with space-saving flat shipment. Bundle of 15 cartons reduces per-unit cost and minimizes warehouse footprint.
Boxes - Corrugated

18x14x10 ECT-48 Double Wall Corrugated Boxes 15-Pack

PN: HD181410DW

18 x 14 x 10 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$69.82 / BUNDLE
IN STOCK 16x16x16 Heavy-Duty Corrugated Shipping Boxes, 300 Pack Pallet, 44 ECT
Boxes - Corrugated

16x16x16 ECT-44 Heavy-Duty Corrugated Shipping Boxes 25-Pack

PN: HD1616

16 x 16 x 16 in ECT-44 Single Wall Corrugated 25 PER BUNDLE
$97.76 / BUNDLE
IN STOCK Premium white corrugated shipping boxes with ECT-32 single-wall construction deliver professional appearance and reliable protection. These 16x16x16 cube boxes feature bright white kraft exterior perfect for custom labels, branded tape, and shipping instructions that stand out. Sold as a convenient 25-box bundle for warehouse managers and fulfillment operations.
Boxes - Corrugated

16x16x16 ECT-32 White Corrugated Shipping Boxes 25-Pack

PN: 161616W

16 x 16 x 16 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$88.18 / BUNDLE
IN STOCK Eliminate carton sizer expenses and reduce SKU inventory with our 16x16x16 multi-depth corrugated boxes. Pre-scored kraft sides fold to multiple heights for perfect fit optimization. Backed by ECT-32 single-wall durability, sold in bundles of 10.
Boxes - Corrugated

16x16x16 ECT-32 Kraft Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MD161616

16 x 16 x 16 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$27.89 / BUNDLE
IN STOCK Ship round and odd-shaped products with confidence using our 16x16x16 ECT-32 kraft corrugated boxes. These versatile cube boxes provide excellent stacking strength and dimensional stability for warehouse-to-customer fulfillment. Bundle of 25 arrives flat for efficient storage and quick assembly.
Boxes - Corrugated

16x16x16 ECT-32 Kraft Cube Corrugated Shipping Boxes 25-Pack

PN: 161616

16 x 16 x 16 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.02 / BUNDLE
IN STOCK Industrial-grade ECT-48 double wall corrugated boxes engineered for maximum stacking strength and freight efficiency. Ships flat to minimize warehouse storage footprint–15 boxes per bundle. Kraft construction handles demanding fulfillment, storage, and shipping applications.
Boxes - Corrugated

16x16x14 ECT-48 Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD161614DW

16 x 16 x 14 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$128.19 / BUNDLE
IN STOCK Heavy-duty ECT-48 double wall corrugated boxes designed for demanding warehouse and fulfillment operations. 16x16x12 dimensions with superior stacking performance and crush resistance. Ships flat in bundles of 10 to maximize storage efficiency and reduce freight costs.
Boxes - Corrugated

16x16x12 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD161612DW

16 x 16 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$40.29 / BUNDLE
IN STOCK Durable 16x16x11" kraft corrugated boxes built with ECT-32 single-wall construction for reliable mid-weight shipping and storage. Each bundle contains 25 boxes, optimizing your freight efficiency and reducing per-unit costs. Fully recyclable and ready to ship.
Boxes - Corrugated

16x16x11 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 161611

16 x 16 x 11 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$59.68 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall kraft cartons engineered for maximum protection and stacking performance. 16" x 16" x 10" dimensions ship flat in bundles of 15, reducing storage footprint and freight costs. Premium corrugated construction ensures your shipments arrive damage-free.
Boxes - Corrugated

16x16x10 ECT-48 Double Wall Corrugated Boxes 15-Pack

PN: HD161610DW

16 x 16 x 10 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$90.33 / BUNDLE
IN STOCK Protect high-value shipments with our 16x16x8 double wall kraft corrugated boxes rated ECT-48. These heavy-duty cartons deliver superior stacking performance and crush resistance–ideal for warehouse managers moving heavier products. Sold in bundles of 15 and ship flat to maximize your storage efficiency and reduce inbound freight.
Boxes - Corrugated

16x16x8 ECT-48 Kraft Double Wall Corrugated Boxes 15-Pack

PN: HD16168DW

16 x 16 x 8 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$52.68 / BUNDLE
IN STOCK Industrial-grade 16x16x6 double wall corrugated cartons rated ECT-48 kraft deliver maximum crush resistance and stacking performance for high-volume fulfillment operations. Ships flat in bundles of 15 to maximize warehouse storage efficiency and reduce freight costs on incoming inventory.
Boxes - Corrugated

16x16x6 ECT-48 Kraft Heavy Duty Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD16166DW

16 x 16 x 6 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$89.78 / BUNDLE
IN STOCK Dependable 14x14x18 corrugated boxes manufactured from ECT-32 kraft material–engineered for standard-duty shipping, storage, and fulfillment operations. Single-wall construction balances strength and cost, making this cardboard box ideal for mid-weight products. Bundle of 25 cartons ready to ship.
Boxes - Corrugated

14x14x18 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 141418

14 x 14 x 18 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.54 / BUNDLE
IN STOCK Heavy-duty ECT-32 single wall corrugated boxes sized 12"L x 12"W x 20"H for mid-weight product shipments and storage. Bundled 25-pack kraft cartons offer proven stacking performance and freight efficiency for warehouse operations. Recyclable, cost-effective shipping solution built for industrial reliability.
Boxes - Corrugated

12x12x20 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 121220

12 x 12 x 20 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$53.45 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 8" × 8" × 24" dimensions–purpose-built for shipping tall items like trophies, shelving, and fishing rods. Strong single-wall construction with end-loading design for fast, efficient packing. Sold and shipped flat in bundles of 25 to maximize your storage and freight efficiency.
Boxes - Corrugated

8x8x24 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 8824

8 x 8 x 24 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$38.86 / BUNDLE
IN STOCK Ship tall items efficiently with these 4x4x28 ECT-32 kraft corrugated boxes. End-loading design for quick, easy packing of fishing rods, trophies, shelving, and similar products. Sold in convenient 25-box bundles, flat-packed to maximize freight efficiency and warehouse storage.
Boxes - Corrugated

4x4x28 ECT-32 Kraft Corrugated Tall Shipping Boxes 25-Pack

PN: 4428

4 x 4 x 28 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$36.52 / BUNDLE
IN STOCK ECT-32 single wall corrugated boxes measuring 20" x 12" x 20" – the proven industry standard for mid-size shipments and warehouse storage. Each bundle contains 20 boxes that ship flat, reducing your freight costs and storage footprint. Built for reliable stacking performance and maximum load capacity.
Boxes - Corrugated

20x12x20 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 201220

20 x 12 x 20 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$91.16 / 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 ->