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 Ship and store flat without sacrificing strength. These 42x11x6 ECT-32 kraft corrugated boxes deliver industry-standard durability in a bundle of 20 units. Perfect for high-volume fulfillment operations seeking to maximize freight efficiency and warehouse space savings.
Boxes - Corrugated

42x11x6 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 42116

42 x 11 x 6 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$100.90 / BUNDLE
IN STOCK ECT-32 single wall kraft corrugated boxes built for serious volume. These 29x24x24 shipping cartons deliver industry-standard stacking strength and collapse-resistant performance. Ships flat in bundles of 10 to maximize your warehouse footprint and cut freight costs.
Boxes - Corrugated

29x24x24 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 292424

29 x 24 x 24 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$136.54 / BUNDLE
IN STOCK Heavy-duty ECT-32 corrugated boxes sized 5" × 5" × 48" for shipping tall items like trophies, shelving, and rods. Sold as a bundle of 25 boxes in flat-pack format for easy storage and freight efficiency. End-loading design enables fast sealing and reduces labor time.
Boxes - Corrugated

5x5x48 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 5548

5 x 5 x 48 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$95.98 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes sized 36" x 18" x 6" deliver the perfect shallow depth for lightweight products without excess material waste. Ideal for apparel, books, artwork, and mirrors, these flat corrugated cartons collapse for storage efficiency and arrive ready to assemble. Bundle of 15 units per order.
Boxes - Corrugated

36x18x6 ECT-32 Kraft Corrugated Boxes 15-Pack

PN: 36186

36 x 18 x 6 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$95.68 / BUNDLE
IN STOCK Heavy-duty ECT-32 kraft corrugated boxes sized 30" × 24" × 20" for maximum payload protection and stacking performance. Single-wall construction delivers industrial-grade strength while maintaining cost efficiency–sold as a convenient bundle of 15 units. Built for warehouse managers and fulfillment operations that demand reliable, recyclable packaging.
Boxes - Corrugated

30x24x20 ECT-32 Kraft Corrugated Heavy Duty Shipping Boxes 15-Pack

PN: 302420

30 x 24 x 20 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$136.63 / BUNDLE
IN STOCK Adjustable two-piece telescoping inner boxes designed for tall and irregularly shaped items up to 48 inches. ECT-32 kraft corrugated with reinforced FOL bottom delivers reliable protection and compression strength. Sold as a 25-pack bundle–pair with T6648OUTER outer cartons to complete your shipping set.
Boxes - Corrugated

6x6x48 ECT-32 Kraft Telescoping Inner Boxes 25-Pack

PN: T6648INNER

6 x 6 x 48 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$87.35 / BUNDLE
IN STOCK Adjustable 48x6x38" telescoping inner boxes built from ECT-44 kraft corrugated for maximum stacking strength on tall and irregularly shaped items. Two-piece design collapses flat for 40% better freight efficiency and warehouse storage. Sold in bundles of 10 with full overlap bottoms for added durability.
Boxes - Corrugated

48x6x38 ECT-44 Kraft Telescoping Boxes Heavy-Duty 10-Pack

PN: T48638INHD

48 x 6 x 38 in ECT-44 Corrugated 10 PER BUNDLE
$189.42 / BUNDLE
IN STOCK Ship long, narrow items efficiently with these 48x6x6 kraft corrugated boxes featuring wide lengthwise openings for fast packing. Built from durable ECT-32 single-wall corrugated material and sold in bundles of 25, these long cartons reduce per-unit costs while maintaining structural integrity. Perfect for wine bottles, umbrellas, carpet rolls, and specialty items.
Boxes - Corrugated

48x6x6 ECT-32 Kraft Corrugated Long Shipping Boxes 25-Pack

PN: 4866

48 x 6 x 6 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$106.17 / BUNDLE
IN STOCK ECT-32 kraft corrugated shipping boxes in 36x18x18" dimensions–standard strength for mid-weight fulfillment and warehouse storage. Sold as a bundle of 15 units for volume savings and freight efficiency. Fully recyclable cardboard construction.
Boxes - Corrugated

36x18x18 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 361818

36 x 18 x 18 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$85.98 / BUNDLE
IN STOCK Industrial-grade 36x18x12 corrugated shipping boxes built from ECT-32 kraft material for dependable strength and compression resistance. Each bundle contains 15 boxes–the standard pack size for warehouse managers and fulfillment operations. Recyclable, cost-effective, and engineered for efficient pallet loading.
Boxes - Corrugated

36x18x12 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 361812

36 x 18 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$71.51 / BUNDLE
IN STOCK Heavy-duty ECT-44 multi-depth corrugated boxes (30x24x24") with pre-scored sides for flexible sizing–eliminate wasted space and reduce dimensional weight penalties. 40% stronger than standard shipping cartons. Sold in bundles of 10.
Boxes - Corrugated

30x24x24 ECT-44 Heavy-Duty Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MDHD302424

30 x 24 x 24 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$117.73 / BUNDLE
IN STOCK Score multiple depths without a carton sizer–fold these 30x24x12 ECT-32 kraft corrugated boxes to your exact height requirements. Eliminate SKU bloat, cut parcel shipping costs, and standardize on one versatile box. Sold in bundles of 15.
Boxes - Corrugated

30x24x12 ECT-32 Kraft Adjustable Multi-Depth Corrugated Shipping Box 15-Pack

PN: MD302412

30 x 24 x 12 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$111.30 / BUNDLE
IN STOCK Ship and store with confidence using our 30x24x10 corrugated boxes (15-pack bundle). ECT-32 single-wall kraft construction delivers dependable stacking strength and impact protection for mid-weight industrial shipments. Recyclable cardboard design reduces waste while maintaining performance standards.
Boxes - Corrugated

30x24x10 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 302410

30 x 24 x 10 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$97.48 / BUNDLE
IN STOCK Adjustable telescoping inner boxes designed for tall and irregularly shaped shipments. ECT-32 single wall kraft corrugated with FOL bottom reinforcement ensures stack strength during transport. Sold as bundle of 15–pair with T141440OUTER carton to complete your two-piece shipping system.
Boxes - Corrugated

14x14x40 ECT-32 Kraft Corrugated Telescoping Inner Boxes 15-Pack

PN: T141440INNER

14 x 14 x 40 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$90.01 / BUNDLE
IN STOCK Ship long items efficiently with 40x14x14 long corrugated boxes featuring wide lengthwise openings for fast packing. ECT-32 kraft construction provides reliable stacking strength, and the 15-box bundle maximizes your freight efficiency–ideal for wine bottles, umbrellas, carpet rolls, and similar elongated products.
Boxes - Corrugated

40x14x14 ECT-32 Kraft Long Corrugated Shipping Boxes 15-Pack

PN: 401414

40 x 14 x 14 in ECT-32 Corrugated 15 PER BUNDLE
$117.67 / BUNDLE
IN STOCK Protect high-value shipments with ECT-48 double wall corrugated construction rated for maximum stacking performance and freight durability. These heavy-duty 36x18x18 kraft boxes deliver superior edge crush strength ideal for warehouse and fulfillment operations. Sold in convenient bundles of 10 and ship flat to minimize storage footprint and reduce inbound freight costs.
Boxes - Corrugated

36x18x18 ECT-48 Double Wall Corrugated Boxes 10-Pack

PN: HD361818DW

36 x 18 x 18 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$156.81 / 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 ->