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 faster with 20x10x8 corrugated boxes featuring convenient long-side openings for quick packing. ECT-32 kraft construction delivers reliable protection while our bundle of 20 reduces per-unit cost. Perfect for wine bottles, umbrellas, carpet rolls, and custom-length products.
Boxes - Corrugated

20x10x8 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 20108

20 x 10 x 8 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$30.76 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 18" x 12" x 18" deliver reliable stacking strength for mid-weight industrial shipping. This 25-pack bundle offers volume savings for warehouse managers and fulfillment operations running consistent shipment volumes. Single-wall construction balances durability with freight efficiency.
Boxes - Corrugated

18x12x18 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181218

18 x 12 x 18 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$61.55 / BUNDLE
IN STOCK Reliable ECT-32 kraft corrugated boxes sized 18" × 12" × 16" for mid-weight shipping and storage applications. Single wall construction delivers proven stacking performance at standard strength. Sold in bundles of 25 to maximize warehouse efficiency and reduce per-unit costs.
Boxes - Corrugated

18x12x16 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181216

18 x 12 x 16 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$62.42 / BUNDLE
IN STOCK ECT-48 double wall kraft corrugated boxes designed for warehouse and fulfillment operations requiring maximum durability and ergonomic handling. Each 18" × 12" × 12" box features reinforced hand holes for convenient grip and transport, with heavy-duty construction that delivers superior stacking performance and protection for mid-weight to heavy products. Sold as a bundle of 15 units.
Boxes - Corrugated

18x12x12 ECT-48 Double Wall Corrugated Shipping Boxes w/ Hand Holes 15-Pack

PN: HD181212DWHH

18 x 12 x 12 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$72.56 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall corrugated boxes engineered for maximum protection and stacking strength on the warehouse floor. These 18" x 12" x 12" kraft cartons ship flat in bundles of 15 to reduce storage footprint and freight costs while ensuring your shipments arrive damage-free.
Boxes - Corrugated

18x12x12 ECT-48 Corrugated Shipping Boxes Heavy Duty 15-Pack

PN: HD1812DW

18 x 12 x 12 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$45.51 / BUNDLE
IN STOCK Fold this 18x12x12 ECT-32 kraft corrugated box down to 6", 9", or 12" height with pre-scored sides–no carton sizer needed. Consolidate multiple SKUs into one inventory item and eliminate dimensional weight overages on parcel shipments. Sold as a bundle of 25 adjustable boxes.
Boxes - Corrugated

18x12x12 ECT-32 Multi-Depth Corrugated Shipping Boxes 25-Pack

PN: MD181212

18 x 12 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$56.14 / BUNDLE
IN STOCK ECT-48 double wall corrugated boxes engineered for maximum protection and stacking performance. These 18x12x10 kraft cartons deliver heavy-duty strength for high-volume fulfillment operations. Bundle of 15 ships flat–reducing storage footprint and freight costs.
Boxes - Corrugated

18x12x10 ECT-48 Double Wall Corrugated Boxes 15-Pack

PN: HD181210DW

18 x 12 x 10 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$45.48 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 18x12x10" dimensions–the ideal size for catalogs, forms, letterhead, and printed materials. Single-wall construction delivers reliable protection at a competitive cost. Sold as a bundle of 25 boxes, perfect for warehouses and fulfillment operations managing regular document shipments.
Boxes - Corrugated

18x12x10 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 181210

18 x 12 x 10 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$42.78 / BUNDLE
IN STOCK Industrial-grade ECT-48 double wall corrugated boxes engineered for high-performance shipping and storage. 18" x 12" x 8" dimensions deliver optimal stacking strength and freight efficiency. Bundle of 15 kraft cartons ships flat to maximize warehouse space and reduce logistics costs.
Boxes - Corrugated

18x12x8 ECT-48 Double Wall Corrugated Boxes 15-Pack

PN: HD18128DW

18 x 12 x 8 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$41.66 / BUNDLE
IN STOCK Protect printed materials, catalogs, and documents with these ECT-32 kraft corrugated boxes in 18x12x8" dimensions. Single-wall construction delivers reliable stacking performance and crush resistance. Sold in convenient 25-box bundles for predictable ordering and freight efficiency.
Boxes - Corrugated

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

PN: 18128

18 x 12 x 8 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$40.61 / BUNDLE
IN STOCK Protect high-value shipments with ECT-48 double wall kraft corrugated boxes. These 18" x 12" x 6" heavy-duty cartons deliver superior stacking strength and crush resistance. Sold in bundles of 15 and ship flat to maximize your warehouse efficiency and reduce freight costs.
Boxes - Corrugated

18x12x6 ECT-48 Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD18126DW

18 x 12 x 6 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$50.17 / BUNDLE
IN STOCK Ship smart with these ECT-32 kraft corrugated boxes sized 18" x 12" x 4"–ideal for shallow products like apparel, books, and artwork. Sold flat in bundles of 25 to maximize storage efficiency and reduce freight spend. Strong single-wall construction delivers reliable protection at competitive volume pricing.
Boxes - Corrugated

18x12x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18124

18 x 12 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$34.24 / BUNDLE
IN STOCK Ship shallow products efficiently with our 18" x 12" x 2" ECT-32 kraft corrugated boxes. Designed for apparel, books, artwork, and picture frames, these flat corrugated cartons arrive bundled 25/case and ship flat to maximize your warehouse space and reduce freight expenses.
Boxes - Corrugated

18x12x2 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 18122

18 x 12 x 2 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$62.39 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping boxes sized 17" × 13" × 13" for reliable mid-weight product protection. Sold as bundles of 25 to maximize freight efficiency and reduce per-unit costs. Recyclable construction meets sustainability and compliance requirements.
Boxes - Corrugated

17x13x13 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 171313

17 x 13 x 13 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$54.50 / BUNDLE
IN STOCK 17x13x7 Kraft Corrugated Shipping Boxes, 425 Pack Pallet, 32 ECT
Boxes - Corrugated

17x13x7 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 17137

17 x 13 x 7 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$65.86 / BUNDLE
IN STOCK ECT-32 single-wall kraft corrugated boxes sized 16" × 14" × 12" deliver dependable stacking performance for mid-weight shipments. Sold as a convenient 25-box bundle to maximize freight efficiency and reduce per-unit packaging costs. Fully recyclable material supports sustainable fulfillment operations.
Boxes - Corrugated

16x14x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 161412

16 x 14 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$54.60 / 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 ->