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-48 double wall corrugated boxes engineered for maximum stacking strength and freight protection. These 12x12x18 kraft cartons arrive flat-packed to reduce warehouse storage footprint and shipping costs. Bundle of 15 units–the industrial standard for mid-size shipments.
Boxes - Corrugated

12x12x18 ECT-48 Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD121218DW

12 x 12 x 18 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$83.49 / BUNDLE
IN STOCK Durable 19x12x7 kraft corrugated boxes with ECT-32 single-wall construction deliver reliable performance for mid-sized shipments and storage. Ship flat to maximize pallet density and cut freight costs by up to 15%. Bundle of 25 boxes–ready to stock your warehouse.
Boxes - Corrugated

19x12x7 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 19127

19 x 12 x 7 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$71.34 / BUNDLE
IN STOCK Optimize your fulfillment operation with these 19x12x3 ECT-32 kraft corrugated boxes–engineered for shallow products like apparel, books, artwork, and framed items. Each bundle of 25 ships flat, maximizing warehouse efficiency and slashing storage overhead. Reliable single-wall construction rated for safe stacking and consistent protection.
Boxes - Corrugated

19x12x3 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 19123

19 x 12 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$53.98 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes sized 18.5" x 12.5" x 12" deliver reliable mid-range strength for typical warehouse and fulfillment operations. This 20-box bundle offers standard stacking performance and efficient freight optimization for e-commerce and logistics applications.
Boxes - Corrugated

18.5x12.5x12 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181212R

18 1/2 x 12.5 x 12 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$47.92 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping boxes deliver dependable mid-weight protection for standard industrial shipments. These 18.5" x 12.5" x 10" kraft cartons are engineered for reliable stacking performance and efficient freight utilization. Sold as a bundle of 20–recyclable, cost-effective packaging solution.
Boxes - Corrugated

18.5x12.5x10 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181210R

18 1/2 x 12.5 x 10 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$38.19 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 18.5x12.5x8 dimensions deliver proven stacking strength for mid-weight industrial shipments. Sold in bundles of 25 to maximize freight efficiency and reduce per-unit costs. Fully recyclable kraft construction meets sustainability goals without sacrificing performance.
Boxes - Corrugated

18.5x12.5x8 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18128R

18 1/2 x 12.5 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$52.04 / BUNDLE
IN STOCK Heavy-duty ECT-32 kraft corrugated boxes sized 18 1/2" × 12 1/2" × 7" for reliable mid-weight shipping and storage. Each bundle includes 25 boxes–reducing per-unit costs and freight complexity for warehouse managers. Recyclable kraft construction meets sustainability standards.
Boxes - Corrugated

18.5x12.5x7 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18127

18 1/2 x 12.5 x 7 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$41.34 / BUNDLE
IN STOCK Heavy-duty ECT-32 kraft corrugated shipping boxes in standard 18.5x12.5x6" dimensions. Sold as a 25-box bundle to maximize volume savings and freight efficiency. Designed for mid-weight products with proven stacking performance in warehouse and fulfillment operations.
Boxes - Corrugated

18.5x12.5x6 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18126R

18 1/2 x 12.5 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$38.97 / BUNDLE
IN STOCK Reliable ECT-32 kraft corrugated boxes in 18x13x12" dimensions designed for mid-weight shipping and storage. Sold as a bundle of 25 units for volume savings and consistent inventory management. Fully recyclable and optimized for warehouse efficiency.
Boxes - Corrugated

18x13x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181312

18 x 13 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.49 / BUNDLE
IN STOCK Premium ECT-32 kraft corrugated boxes sized 18" × 13" × 5" for shallow products and efficient shipping. Bundle of 25 units ships flat to maximize warehouse space and minimize freight spend. Perfect for apparel, books, artwork, and picture frames.
Boxes - Corrugated

18x13x5 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18135

18 x 13 x 5 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$68.96 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 17x14x14 dimensions deliver proven stacking performance and freight efficiency for mid-weight industrial shipments. This 25-pack bundle of standard-strength cardboard boxes is ideal for warehouses and fulfillment centers managing consistent volume. Recyclable construction reduces your sustainability footprint.
Boxes - Corrugated

17x14x14 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 171414

17 x 14 x 14 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$59.97 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes sized 17" × 14" × 9" deliver reliable performance for mid-weight products at standard strength ratings. Each bundle includes 25 boxes, providing efficient volume pricing for warehouse managers and fulfillment operations. Fully recyclable kraft construction supports sustainability goals while maintaining proven stacking performance.
Boxes - Corrugated

17x14x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 17149

17 x 14 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$52.13 / BUNDLE
IN STOCK Heavy-duty 21x10x10" corrugated shipping boxes engineered for demanding warehouse and fulfillment operations. ECT-32 kraft construction delivers proven stackability and freight efficiency in a convenient bundle of 25. Recyclable kraft material reduces your environmental footprint while maintaining rigorous strength standards.
Boxes - Corrugated

21x10x10 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 211010

21 x 10 x 10 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$43.21 / BUNDLE
IN STOCK Ship smarter with these 19x12x4 ECT-32 kraft corrugated boxes–engineered for shallow products like apparel, books, and artwork. Bundle of 25 ships flat to maximize your warehouse efficiency and cut freight expenses. Reliable single-wall construction that stacks securely in transit.
Boxes - Corrugated

19x12x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 19124

19 x 12 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$37.48 / BUNDLE
IN STOCK Versatile 18.5" x 12.5" x 14" kraft corrugated shipping boxes built from ECT-32 single-wall material–ideal for mid-weight products. Sold in bundles of 20 for volume efficiency. Fully recyclable and engineered for reliable stacking performance in warehouse and fulfillment operations.
Boxes - Corrugated

18.5x12.5x14 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 181214

18 1/2 x 12.5 x 14 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$46.40 / BUNDLE
IN STOCK Heavy-duty ECT-32 single wall kraft corrugated boxes in 18.5" x 12.5" x 9" dimensions, sold as a convenient 25-box bundle. Engineered for reliable stacking, mid-range weight freight, and cost-effective warehouse storage. Recyclable kraft material meets standard industrial shipping requirements.
Boxes - Corrugated

18 1/2x12 1/2x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18129

18 1/2 x 12.5 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$46.35 / BUNDLE

Product Help Request

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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 ->