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 single wall corrugated boxes sized 13" x 13" x 12" deliver reliable stacking strength for mid-weight shipments. Ships flat in bundles of 25 to maximize warehouse space and reduce freight costs. The industry standard for cost-effective fulfillment operations.
Boxes - Corrugated

13x13x12 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 131312

13 x 13 x 12 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$60.08 / BUNDLE
IN STOCK 13x13x9 Kraft Corrugated Shipping Boxes, 700 Pack Pallet, 32 ECT
Boxes - Corrugated

13x13x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 13139

13 x 13 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$40.01 / BUNDLE
IN STOCK 13x13x7 Kraft Corrugated Heavy Duty Shipping Boxes, 775 Pack Pallet, 32 ECT
Boxes - Corrugated

13x13x7 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 25-Pack

PN: 13137R

13 x 13 x 7 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$36.78 / BUNDLE
IN STOCK Ship smarter with our 13x13x4 ECT-32 kraft corrugated boxes–engineered for shallow products and optimized for warehouse efficiency. Each bundle of 25 ships flat, slashing your storage footprint and freight costs. Perfect for apparel, books, artwork, and picture frames.
Boxes - Corrugated

13x13x4 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 13134

13 x 13 x 4 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$29.91 / BUNDLE
IN STOCK 13x13x3 Kraft Corrugated Shipping Boxes, 600 Pack Pallet, 32 ECT
Boxes - Corrugated

13x13x3 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 13133

13 x 13 x 3 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$47.16 / BUNDLE
IN STOCK Industrial-grade ECT-32 kraft corrugated boxes sized 12x12x14 inches–built for reliable stacking and freight efficiency in high-volume operations. This 25-box bundle delivers standard strength performance at competitive bulk pricing, making it ideal for e-commerce fulfillment, warehouse storage, and daily shipping needs.
Boxes - Corrugated

12x12x14 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 121214

12 x 12 x 14 in ECT-32 Corrugated 25 PER BUNDLE
$43.80 / BUNDLE
IN STOCK 12x12x12 Triple Wall Corrugated Boxes Heavy-Duty, 35 Pack Pallet, 90 ECT
Boxes - Corrugated

12x12x12 ECT-90 Triple Wall Corrugated Boxes Heavy-Duty 5-Pack

PN: HD121212TW

12 x 12 x 12 in TW/ECT-90 Corrugated 5 PER BUNDLE
$159.89 / BUNDLE
IN STOCK 10x10x16 Kraft Corrugated Shipping Boxes, 450 Pack Pallet, 32 ECT
Boxes - Corrugated

10x10x16 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 101016

10 x 10 x 16 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$62.95 / BUNDLE
IN STOCK 8x8x18 Kraft Corrugated Shipping Boxes, 950 Pack Pallet, 32 ECT
Boxes - Corrugated

8x8x18 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 8818

8 x 8 x 18 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$29.85 / BUNDLE
IN STOCK Durable ECT-32 kraft corrugated boxes designed for vertical shipping of tall items like trophies, rods, and shelving. End-loading design speeds packing and sealing. Sold flat in bundles of 25 for maximum warehouse efficiency.
Boxes - Corrugated

6x6x20 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 6620

6 x 6 x 20 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$38.32 / BUNDLE
IN STOCK ECT-48 heavy-duty double wall corrugated boxes sized 16" x 10" x 10" for maximum protection and stacking performance. Bundle of 15 ships flat to reduce warehouse footprint and freight costs. Built for warehouse managers and fulfillment centers demanding superior durability.
Boxes - Corrugated

16x10x10 ECT-48 Kraft Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD161010DW

16 x 10 x 10 in D.W./ECT-48 Corrugated 15 PER BUNDLE
$56.86 / BUNDLE
IN STOCK 15x12x6 Kraft Corrugated Shipping Boxes, 800 Pack Pallet, 32 ECT
Boxes - Corrugated

15x12x6 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 15126

15 x 12 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$35.26 / BUNDLE
IN STOCK Master your freight costs with this precision-engineered 12.75x12.75x13.5 corrugated box. Engineered to consolidate eight standard 6" cubes with zero wasted space, this ECT-32 kraft carton eliminates void fill and reduces dimensional weight charges. Order by the bundle of 25 and maximize your pallet density today.
Boxes - Corrugated

12.75x12.75x13.5 ECT-32 Kraft Master Carton Box 25-Pack

PN: 121213

12 3/4 x 12 3/4 x 13 1/2 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$51.67 / BUNDLE
IN STOCK Ship hazardous materials safely with these UN 4G/Y37.6/S certified haz mat boxes designed for 1–5 gallon containers. Built from ECT-51 double wall kraft corrugated, they deliver superior stacking strength and crush resistance. Bundle of 10 ships flat to maximize warehouse space and reduce freight costs.
Boxes - Corrugated

12 1/8x12 1/8x13 9/16 ECT-51 Haz Mat Boxes 10-Pack

PN: HAZCO15G

12 1/8 x 12 1/8 x 13 9/16 in ECT-51 Double Wall Corrugated 10 PER BUNDLE
$92.72 / BUNDLE
IN STOCK Move inventory faster with our 16x11x10 corrugated boxes–25-pack bundles built for serious warehouse operations. ECT-32 kraft construction delivers proven stacking strength and freight efficiency without premium pricing. Perfect for mid-size shipments that demand reliability.
Boxes - Corrugated

16x11x10 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 161110

16 x 11 x 10 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$44.29 / BUNDLE
IN STOCK Dependable 16x11x9 corrugated shipping boxes built from ECT-32 kraft material for consistent performance in high-volume fulfillment. Each bundle contains 25 boxes–ideal for mid-size shipments and cost-effective inventory management. Stackable, recyclable, and ready to reduce your packaging costs.
Boxes - Corrugated

16x11x9 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 16119

16 x 11 x 9 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$39.15 / 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

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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 ->