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 ECT-32 kraft corrugated boxes sized 24" × 16" × 24" deliver reliable standard strength performance for mid-weight shipping and storage applications. Sold in bundles of 10, these recyclable cardboard shipping boxes reduce per-unit costs and freight waste. Ideal for warehouse managers and fulfillment operations managing volume shipments efficiently.
Boxes - Corrugated

24x16x24 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 241624

24 x 16 x 24 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$44.61 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall corrugated boxes in 22x18x16" dimensions deliver superior protection and stacking performance for demanding warehouse operations. Kraft kraft construction resists crushing and punctures, while flat-ship bundling reduces storage footprint and freight costs by up to 40%. Sold in bundles of 10 cartons.
Boxes - Corrugated

22x18x16 ECT-48 Kraft Double Wall Corrugated Boxes 10-Pack

PN: HD221816DW

22 x 18 x 16 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$82.45 / BUNDLE
IN STOCK Heavy-duty 20x20x20 double wall corrugated boxes built from ECT-48 kraft material deliver superior stacking strength and protection for large shipments, monitor packaging, and demanding freight environments. Ships flat in bundles of 10 to maximize storage efficiency and reduce your packaging footprint. Ideal for warehouse managers seeking reliable, cost-effective bulk shipping cartons.
Boxes - Corrugated

20x20x20 ECT-48 Double Wall Corrugated Boxes 10-Pack

PN: HD202020DW

20 x 20 x 20 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$65.22 / BUNDLE
IN STOCK Heavy-duty ECT-44 corrugated cartons with pre-scored multi-depth design eliminate wasted space and reduce DIM weight penalties on UPS/FedEx shipments. Cut to multiple sizes without additional inventory. 40% stronger than standard shipping boxes–sold as bundle of 10 kraft cartons.
Boxes - Corrugated

20x20x20 ECT-44 Heavy-Duty Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MDHD202020

20 x 20 x 20 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$60.90 / BUNDLE
IN STOCK Durable ECT-32 white corrugated cube boxes sized 20x20x20" for maximum label visibility and professional shipment appearance. Same rugged single-wall construction as kraft alternatives–sold in convenient bundles of 10 for volume efficiency. Ideal for warehouse managers seeking unprinted corrugated cartons that maintain structural integrity under standard stacking loads.
Boxes - Corrugated

20x20x20 ECT-32 White Corrugated Shipping Boxes 10-Pack

PN: 202020W

20 x 20 x 20 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$64.09 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated boxes sized 20" x 18" x 22" built for high-volume warehouses and fulfillment centers. Each bundle of 10 delivers proven stacking performance and freight efficiency without compromising durability. Recyclable kraft construction reduces your environmental footprint while maximizing storage density.
Boxes - Corrugated

20x18x22 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 201822

20 x 18 x 22 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$46.02 / BUNDLE
IN STOCK Industrial-grade 16x16x24" corrugated shipping boxes built from ECT-32 kraft material for reliable stacking and freight efficiency. Each bundle includes 20 boxes ready for immediate deployment in warehouse and fulfillment operations. Recyclable kraft construction reduces environmental impact while delivering the strength your operation demands.
Boxes - Corrugated

16x16x24 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 161624

16 x 16 x 24 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$72.37 / BUNDLE
IN STOCK ECT-32 kraft corrugated cartons engineered for shallow products–apparel, books, frames, and artwork. 26x15x7 dimensions minimize wasted space and freight costs. Ships flat in bundles of 20 for maximum storage efficiency.
Boxes - Corrugated

26x15x7 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 26157

26 x 15 x 7 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$54.62 / BUNDLE
IN STOCK ECT-48 double wall corrugated boxes engineered for warehouse efficiency and maximum protection. Integrated hand holes eliminate manual handling strain while kraft construction delivers industry-leading stacking strength and crush resistance. Bundle of 10 boxes optimizes freight efficiency and reduces per-unit costs.
Boxes - Corrugated

20x20x20 ECT-48 Double Wall Corrugated Shipping Boxes with Hand Holes 10-Pack

PN: HD202020DWHH

20 x 20 x 20 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$103.72 / BUNDLE
IN STOCK ECT-71 heavy-duty double wall corrugated boxes engineered for maximum protection and stacking performance. These 20x20x20" kraft cartons deliver 140# burst strength capacity–ideal for high-volume distribution centers and warehouses shipping heavy or fragile goods. Sold in bundles of 10 for bulk efficiency.
Boxes - Corrugated

20x20x20 ECT-71 Double Wall Boxes 10-Pack

PN: HD202020HDDW

20 x 20 x 20 in ECT-71 Double Wall Corrugated 10 PER BUNDLE
$218.32 / BUNDLE
IN STOCK Adjust from 4" to 30" height to fit tall and irregularly shaped items with ECT-32 kraft corrugated strength. These telescoping inner boxes feature a full overlap bottom for superior stacking performance in your warehouse. Sold in bundles of 10–pair with T37430OUTER to complete the set.
Boxes - Corrugated

37x4x30 ECT-32 Telescoping Inner Boxes 10-Pack

PN: T37430INNER

37 x 4 x 30 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$104.97 / BUNDLE
IN STOCK ECT-32 single-wall kraft inner mirror boxes engineered for safe glass and fragile item shipping. 37" x 3.75" x 30.75" dimensions with proven stacking strength. Sold in bundles of 10–pair with our OUTERMIRROR outer box for complete two-wall protection and professional handling compliance.
Boxes - Corrugated

37x3.75x30.75 ECT-32 Kraft Inner Mirror Box 10-Pack

PN: INNERMIRROR

37 x 3.75 x 30 3/4 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$75.11 / BUNDLE
IN STOCK ECT-32 kraft corrugated side loading boxes designed for high-speed fulfillment operations. Full overlap (FOL) flaps provide superior product protection while end-loading design maximizes operational efficiency. Ships flat in bundles of 20 to reduce storage footprint and freight costs.
Boxes - Corrugated

36x5x30 ECT-32 Kraft Side Loading Boxes 20-Pack

PN: 36530FOL

36 x 5 x 30 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$95.27 / BUNDLE
IN STOCK End-load your products with confidence using these 36x5x24 corrugated side loading boxes. Engineered with ECT-32 kraft material and full overlap flaps for maximum protection during storage and transit. Ships flat to maximize warehouse efficiency–20 boxes per bundle.
Boxes - Corrugated

36x5x24 ECT-32 Kraft Full Overlap Side Loading Boxes 20-Pack

PN: 36524FOL

36 x 5 x 24 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$98.07 / BUNDLE
IN STOCK Standard-duty corrugated shipping boxes sized 27" × 14" × 9" in ECT-32 kraft construction. Sold in bundles of 20 for consistent inventory management and freight efficiency. Built to protect light-to-medium products while maximizing pallet density and reducing packaging costs per unit.
Boxes - Corrugated

27x14x9 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 27149

27 x 14 x 9 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$54.79 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 26x15x5" dimensions–purpose-built for shallow products like apparel, books, frames, and artwork. Ships flat in bundles of 20 to maximize warehouse storage and minimize freight costs. Durable single-wall construction rated for reliable stacking and transit protection.
Boxes - Corrugated

26x15x5 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 26155

26 x 15 x 5 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$50.76 / 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 ->