Boxes & Mailers

SELECTION EXPERT ADVICE

Wall Strength & Load Capacity
MORE INFO
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
MORE INFO
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
MORE INFO
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 Get reliable ECT-32 corrugated boxes in convenient 20-pack retail quantities–perfect for low-volume fulfillment operations. These 18x14x12" kraft cartons deliver proven stacking strength without bulk inventory commitments. Ships flat to save warehouse space and freight costs.
Boxes - Corrugated

18x14x12 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181412RP20

18 x 14 x 12 in ECT-32 Corrugated 20 PER PACK
$57.19 / PACK
IN STOCK Precision-engineered 18x14x12" corrugated shipping cartons in convenient 10-pack retail quantities. ECT-32 kraft construction delivers reliable stacking strength and protection for mid-sized orders. Ships flat to maximize warehouse storage efficiency–ideal for smaller fulfillment operations.
Boxes - Corrugated

18x14x12 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 181412RP10

18 x 14 x 12 in ECT-32 Corrugated 10 PER PACK
$24.67 / PACK
IN STOCK Protect high-value frames and corners with pre-scored ECT-32 corrugated protectors that adjust from 1/2" to 2" deep. Each case delivers 504 units that ship flat, assemble fast, and lock securely onto frame corners. Proven to reduce damage claims and freight loss.
Boxes - Corrugated

4x4 ECT-32 Corrugated Frame Protectors 504/Case

PN: FR44MD

4 x 4 x 1/2-2 in ECT-32 Single Wall Corrugated 504 PER CASE
$102.83 / CASE
IN STOCK Protect high-value frames and artwork from transit damage with our ECT-32 corrugated frame protectors. Pre-scored design adjusts to fit 1/2" to 1 3/8" depths, locks securely onto front corners, and ships flat for maximum freight efficiency. Get 630 units per case–ideal for warehouses and fulfillment centers handling delicate items.
Boxes - Corrugated

3.25x3.25 ECT-32 Corrugated Frame Protectors 630/Case

PN: FR44

3 1/4 x 3 1/4 x 1/2-1 3/8 in ECT-32 Single Wall Corrugated 630 PER CASE
$111.84 / CASE
IN STOCK Heavy-duty ECT-32-B corrugated carrying cases engineered for warehouse efficiency. 24x14x4" dimensions with integrated plastic handles and crush-resistant white corrugated construction. Bundle of 10 ready to ship–maximize your freight utilization and reduce per-unit costs.
Boxes - Mailers

24x14x4 ECT-32-B White Corrugated Carrying Cases 10/Bundle

PN: MCC6

24 x 14 x 4 in ECT-32-B Corrugated 10 PER BUNDLE
$68.70 / BUNDLE
IN STOCK ECT-32-B crush-resistant white corrugated carrying cases with integrated plastic handles. Dimensions: 18.25" x 11.375" x 2.6875". Sold as bundle of 10 units. Perfect for warehouses and fulfillment operations requiring durable, stackable shipping mailers that protect products while reducing freight costs.
Boxes - Mailers

18.25x11.375x2.6875 ECT-32 White Corrugated Carrying Case with Handles 10/Bundle

PN: MCC2

18 1/4 x 11.375 x 2 11/16 in ECT-32-B Corrugated 10 PER BUNDLE
$36.15 / BUNDLE
IN STOCK Professional-grade ECT-32-B white corrugated carrying cases built for frequent handling and transport. Each case includes integrated plastic handles and measures 12 1/8" 9 1/4" 3". Sold in bundles of 10 for maximum cost efficiency and freight optimization.
Boxes - Mailers

12 1/8 x 9 1/4 x 3 in ECT-32-B White Corrugated Carrying Cases with Handles 10/Bundle

PN: MCC1

12 1/8 x 9 1/4 x 3 in ECT-32-B Corrugated 10 PER BUNDLE
$29.21 / BUNDLE
IN STOCK Ship round, cylindrical, and odd-shaped products with confidence using our 3x3x3 ECT-32 kraft corrugated cube boxes. Manufactured from durable single-wall corrugated material, this popular size delivers reliable protection and optimal freight efficiency. Sold in convenient bundles of 25 boxes, flat-shipped to maximize your warehouse space and reduce packaging costs.
Boxes - Corrugated

3x3x3 ECT-32 Kraft Corrugated Cube Shipping Box 25-Pack

PN: 333

3 x 3 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$10.91 / BUNDLE
IN STOCK Compact 4x4x3" corrugated boxes built from ECT-32 kraft material for reliable protection on lightweight items and small parts shipments. This 25-box bundle delivers cost-effective packaging for warehouse operations, e-commerce fulfillment, and storage applications. Recyclable kraft construction supports your sustainability goals while maintaining structural integrity.
Boxes - Corrugated

4x4x3 ECT-32 Kraft Corrugated Shipping Boxes

PN: 443

4 x 4 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$13.66 / BUNDLE
IN STOCK White corrugated shipping boxes in a compact 4x4x4 cube design, built with ECT-32 single wall strength. Perfect for small product shipments, sample boxes, or retail fulfillment. Sold in bundles of 25 to maximize your packaging efficiency and reduce per-unit costs.
Boxes - Corrugated

4x4x4 ECT-32 White Corrugated Shipping Boxes 25-Pack

PN: 444W

4 x 4 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$13.09 / BUNDLE
IN STOCK 4 x 4 x 4-inch kraft multi-depth corrugated box, SKU MD444.
Boxes - Corrugated

4x4x4 ECT-32 Kraft Multi-Depth Corrugated Shipping Boxes 25-Pack

PN: MD444

4 x 4 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$13.67 / BUNDLE
IN STOCK 4x4x4 Kraft Cube Corrugated Shipping Boxes, 3,425 Pack Pallet, 32 ECT
Boxes - Corrugated

4x4x4 ECT-32 Kraft Cube Corrugated Shipping Boxes 25-Pack

PN: 444

4 x 4 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$8.07 / BUNDLE
IN STOCK Optimize shipping costs for long, narrow products with 6x3x3 ECT-32 kraft corrugated boxes. Wide lengthwise opening for fast packing of wine bottles, umbrellas, and carpet rolls. Bundle of 25 flat cartons ready to assemble.
Boxes - Corrugated

6x3x3 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 633

6 x 3 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$14.01 / BUNDLE
IN STOCK Dependable 5x4x4 corrugated shipping boxes in ECT-32 kraft single wall construction. Bundle of 25 cartons delivers consistent strength for small-to-medium item fulfillment. Industry-standard kraft material ensures recyclable, cost-effective packaging that stacks efficiently in warehouse operations.
Boxes - Corrugated

5x4x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 544

5 x 4 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$11.88 / BUNDLE
IN STOCK 4x4x5 Kraft Corrugated Shipping Boxes, 1,850 Pack Pallet, 32 ECT
Boxes - Corrugated

4x4x5 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 445

4 x 4 x 5 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$15.05 / BUNDLE
IN STOCK 4 7/16x4 7/16x5 ECT-44 Haz Mat Boxes - UN , Bundle of 25
Boxes - Corrugated

4 7/16x4 7/16x5 ECT-44 Haz Mat Boxes 25-Pack

PN: HAZCO1Q

4 7/16 x 4 7/16 x 5 in ECT-44 Single Wall Corrugated 25 PER BUNDLE
$110.14 / BUNDLE

Product Help Request

Send the SKU, quantity, delivery ZIP, and any required specs so we can route the request.

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

Use filters and product titles to narrow by the specs that affect fit.

Confirm

Open the product page before ordering a case so you can check quantity, unit, and limits.

Reorder

Save the SKU or product link for repeat purchasing and support questions.

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 ->