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 Ship long, narrow items efficiently with these 24x6x8 ECT-32 kraft corrugated boxes. Wide lengthwise openings accelerate packing while ECT-32 single-wall construction handles regional freight. Sold in bundles of 25 for maximum volume savings.
Boxes - Corrugated

24x6x8 ECT-32 Kraft Corrugated Boxes 25-Pack

PN: 2468

24 x 6 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$29.69 / BUNDLE
IN STOCK Ship long, narrow items efficiently with these 24x6x6 ECT-32 kraft corrugated boxes featuring wide length-wise openings for fast packing. ECT-32 single-wall construction delivers reliable protection while the narrow profile maximizes freight efficiency. Sold as a bundle of 25 boxes, shipped flat to reduce storage footprint.
Boxes - Corrugated

24x6x6 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 2466

24 x 6 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$25.54 / BUNDLE
IN STOCK Industrial-grade 20x10x12 corrugated shipping boxes built from ECT-32 kraft material for reliable protection and stackability. Each bundle contains 25 boxes–ideal for e-commerce fulfillment, warehouse storage, and logistics operations. Recyclable kraft construction reduces your environmental footprint while maximizing freight efficiency.
Boxes - Corrugated

20x10x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 201012

20 x 10 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$45.92 / BUNDLE
IN STOCK Ship long, narrow items efficiently with our 20x10x6" ECT-32 kraft corrugated boxes. Wide long-side opening speeds packing of wine bottles, umbrellas, carpet rolls, and similar products. Sold as a 25-box bundle–ideal for high-volume fulfillment centers.
Boxes - Corrugated

20x10x6 ECT-32 Kraft Corrugated Boxes 25-Pack

PN: 20106

20 x 10 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$34.10 / BUNDLE
IN STOCK 20x10x4 Kraft Corrugated Shipping Boxes, 950 Pack Pallet, 32 ECT
Boxes - Corrugated

20x10x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 20104

20 x 10 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$29.69 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated shipping boxes sized 18" x 12" x 14" deliver reliable stacking performance for mid-weight products. This 25-box bundle reduces per-unit costs while maintaining structural integrity for efficient fulfillment operations. Recyclable kraft construction supports sustainable warehouse practices.
Boxes - Corrugated

18x12x14 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181214R

18 x 12 x 14 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$55.68 / BUNDLE
IN STOCK ECT-44 single wall kraft corrugated boxes engineered for maximum stacking strength and damage protection. These 18x12x12 heavy-duty cartons deliver 40% greater crush resistance than standard shipping containers, making them ideal for high-volume fulfillment operations. Sold flat in bundles of 25 for maximum freight efficiency and warehouse storage.
Boxes - Corrugated

18x12x12 ECT-44 Kraft Heavy-Duty Corrugated Shipping Boxes 25-Pack

PN: HD1812

18 x 12 x 12 in ECT-44 Single Wall Corrugated 25 PER BUNDLE
$66.40 / BUNDLE
IN STOCK Ship with confidence using ECT-32 white corrugated boxes engineered for reliable stacking and freight efficiency. These 18x12x12 shipping cartons deliver the same durability as standard kraft boxes while presenting a crisp, professional appearance that makes applied labels and shipping instructions stand out. Bundle of 25 boxes reduces per-unit costs and minimizes storage footprint.
Boxes - Corrugated

18x12x12 ECT-32 White Corrugated Shipping Boxes 25-Pack

PN: 181212W

18 x 12 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$57.88 / BUNDLE
IN STOCK Protect high-value printed materials with ECT-32 kraft corrugated boxes sized specifically for standard paper formats. These 18x12x12 shipping cartons provide reliable stacking performance and efficient freight utilization. Sold in bundles of 25 boxes.
Boxes - Corrugated

18x12x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181212

18 x 12 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$43.49 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes in 18" × 12" × 9" dimensions, sold as a convenient bundle of 25. Engineered to protect printed materials, documents, catalogs, and letterhead during storage and shipment. Proven stacking performance meets industrial warehouse standards.
Boxes - Corrugated

18x12x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18129R

18 x 12 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$44.35 / BUNDLE
IN STOCK 18x12x8 White Corrugated Shipping Boxes, 375 Pack Pallet, 32 ECT
Boxes - Corrugated

18x12x8 ECT-32 White Corrugated Shipping Boxes 25-Pack

PN: 18128W

18 x 12 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$78.38 / BUNDLE
IN STOCK 18x12x7 Kraft Corrugated Shipping Boxes, 600 Pack Pallet, 32 ECT
Boxes - Corrugated

18x12x7 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18127R

18 x 12 x 7 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$47.61 / BUNDLE
IN STOCK ECT-32 single-wall white corrugated boxes designed for warehouse managers who need reliable, label-ready shipping cartons. 18" × 12" × 6" dimensions provide 1,296 cu. in. of usable space with strong stacking performance. Sold as 25-box bundle–ideal for freight consolidation and inventory management.
Boxes - Corrugated

18x12x6 ECT-32 White Corrugated Shipping Boxes 25-Pack

PN: 18126W

18 x 12 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$62.28 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes sized specifically for standard paper formats. 18" x 12" x 6" dimensions fit catalogs, forms, letterhead, and printed materials perfectly. Sold in bundles of 25 for maximum freight efficiency and volume savings.
Boxes - Corrugated

18x12x6 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18126

18 x 12 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$36.67 / BUNDLE
IN STOCK 18x12x5 Kraft Corrugated Shipping Boxes, 725 Pack Pallet, 32 ECT
Boxes - Corrugated

18x12x5 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18125

18 x 12 x 5 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$38.59 / BUNDLE
IN STOCK 18x12x3 Kraft Corrugated Shipping Boxes, 475 Pack Pallet, 32 ECT
Boxes - Corrugated

18x12x3 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18123

18 x 12 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$59.96 / 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

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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 ->