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 Adjust height to fit tall and irregular items with this two-piece telescoping outer box. ECT-32 kraft construction with full overlap bottom delivers reliable stacking strength and freight stability. Sold as bundle of 15–pair with T12448INNER to complete your shipping solution.
Boxes - Corrugated

12.5x4.5x48 ECT-32 Kraft Adjustable Telescoping Outer Boxes 15-Pack

PN: T12448OUTER

12 1/2 x 4.5 x 48 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$105.05 / BUNDLE
IN STOCK Heavy-duty ECT-44 telescoping outer cartons (48½" × 6½" × 38") designed for tall and irregularly shaped items. Adjustable two-piece construction with full overlap bottom strengthens stacking performance. Sold as bundle of 10–pair with matching inner cartons to complete the set.
Boxes - Corrugated

48x38 ECT-44 Adjustable Heavy-Duty Telescoping Outer Box 10-Pack

PN: T48638OUTHD

48 x 38 x 38 in ECT-44 Corrugated 10 PER BUNDLE
$206.29 / BUNDLE
IN STOCK ECT-32 kraft corrugated boxes in 34x21x6" dimensions designed for shallow-depth products like apparel, books, and framed items. Ships flat to maximize storage efficiency and reduce freight costs. Sold as a bundle of 10 cartons.
Boxes - Corrugated

34x21x6 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 34216

34 x 21 x 6 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$75.57 / BUNDLE
IN STOCK Ship heavier loads safely with ECT-48 double wall corrugated boxes built for maximum stacking strength and freight efficiency. These 24x24x30 kraft cartons deliver superior cushioning and structural integrity for demanding warehouse operations. Bundle of 5 ships flat to maximize storage space and reduce shipping costs.
Boxes - Corrugated

24x24x30 ECT-48 Kraft Double Wall Corrugated Shipping Boxes 5-Pack

PN: HD242430DW

24 x 24 x 30 in ECT-48 Double Wall Corrugated 5 PER BUNDLE
$90.00 / BUNDLE
IN STOCK Engineered for tall and irregularly shaped items, these 6.75x6.75x48 double wall telescoping cartons feature an adjustable two-piece design with FOL bottom reinforcement. ECT-48 kraft corrugated construction rated for heavy stacking. Sold in bundles of 15 outer boxes (pair with T6648INNERDW inner cartons to complete your set).
Boxes - Corrugated

6.75x6.75x48 ECT-48 Double Wall Telescoping Boxes 15-Pack

PN: T6648OUTERDW

6 3/4 x 6 3/4 x 48 in D.W./ECT-48 Corrugated 15 PER BUNDLE
$129.43 / BUNDLE
IN STOCK Industrial-grade 6x6x48 double wall corrugated boxes manufactured from ECT-48 kraft material deliver maximum stacking strength and impact protection for demanding fulfillment operations. Each bundle of 15 ships flat, cutting storage footprint and freight costs. Purpose-built for warehouse managers who need reliable, high-performance shipping cartons without compromise.
Boxes - Corrugated

6x6x48 ECT-48 Kraft Heavy Duty Double Wall Corrugated Shipping Boxes 15-Pack

PN: HD6648DW

6 x 6 x 48 in ECT-48 Double Wall Corrugated 15 PER BUNDLE
$97.26 / BUNDLE
IN STOCK Heavy-duty ECT-48 double wall corrugated boxes designed for maximum protection and stacking performance in high-volume fulfillment environments. Each 48x12x12 kraft carton delivers superior crush resistance and freight efficiency. Sold in bundles of 10 and ship flat to reduce warehouse storage footprint.
Boxes - Corrugated

48x12x12 ECT-48 Kraft Heavy-Duty Corrugated Double Wall Shipping Boxes 10-Pack

PN: HD481212DW

48 x 12 x 12 in ECT-48 Double Wall Corrugated 10 PER BUNDLE
$122.26 / BUNDLE
IN STOCK Ship tall items efficiently with our 5x5x50 corrugated boxes in ECT-32 kraft material. End-load design for fast, secure packing of fishing rods, trophies, shelving, and more. Bundle of 25 boxes ships flat to maximize freight savings.
Boxes - Corrugated

5x5x50 ECT-32 Kraft Corrugated Shipping Boxes 25-Pack

PN: 5550

5 x 5 x 50 in ECT-32 Single Wall Corrugated 25 PER BUNDLE
$99.30 / BUNDLE
IN STOCK ECT-44 single wall kraft corrugated side loading boxes designed for warehouse efficiency and maximum freight optimization. 40" x 5" x 45" dimensions ship flat in bundles of 10, reducing storage footprint while maintaining superior stacking strength. Purpose-built for fulfillment centers requiring reliable, cost-effective shipping cartons.
Boxes - Corrugated

40x5x45 ECT-44 Kraft Side Loading Boxes 10-Pack

PN: HD40545FOL

40 x 5 x 45 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$179.29 / BUNDLE
IN STOCK ECT-32 kraft telescoping inner boxes engineered for tall and irregularly shaped shipments. 8" x 8" x 48" adjustable two-piece corrugated cartons with full overlap (FOL) bottom construction. Sold as bundle of 20–pair with T8848OUTER to complete your shipping set.
Boxes - Corrugated

8x8x48 ECT-32 Kraft Telescoping Inner Boxes 20-Pack

PN: T8848INNER

8 x 8 x 48 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$68.97 / BUNDLE
IN STOCK Maximize your fulfillment efficiency with these 48x8x24 ECT-44 kraft corrugated side loading boxes. Ship and store flat to reduce warehouse footprint and freight costs by up to 40%. Bundle of 10 ready-to-assemble cartons designed for high-volume operations.
Boxes - Corrugated

48x8x24 ECT-44 Kraft Side Loading Boxes 10-Pack

PN: HD48824FOL

48 x 8 x 24 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$150.25 / BUNDLE
IN STOCK Ship long, narrow items efficiently with these 48x8x8 ECT-32 kraft corrugated boxes. Wide lengthwise openings reduce packing time and labor costs. Sold flat in bundles of 20 for maximum freight efficiency and storage savings.
Boxes - Corrugated

48x8x8 ECT-32 Kraft Corrugated Shipping Boxes 20-Pack

PN: 4888

48 x 8 x 8 in ECT-32 Single Wall Corrugated 20 PER BUNDLE
$72.19 / BUNDLE
IN STOCK ECT-32 single-wall corrugated boxes sized 36" × 20" × 9" for efficient garment and apparel shipping. Ship clothing with or without hangers in one reliable kraft carton. Sold as 15-box bundle for volume savings.
Boxes - Corrugated

36x20x9 ECT-32 Kraft Corrugated Shipping Boxes 15-Pack

PN: 36209

36 x 20 x 9 in ECT-32 Single Wall Corrugated 15 PER BUNDLE
$130.23 / BUNDLE
IN STOCK ECT-44 heavy-duty multi-depth kraft corrugated cartons deliver 40% greater stacking strength than standard shipping containers. Pre-scored sides adjust from full 32x24x24 depth down to smaller profiles–one SKU replaces multiple box sizes, cutting inventory and storage overhead. Includes 10 flat-packed boxes per bundle.
Boxes - Corrugated

32x24x24 ECT-44 Heavy-Duty Multi-Depth Corrugated Shipping Boxes 10-Pack

PN: MDHD322424

32 x 24 x 24 in ECT-44 Single Wall Corrugated 10 PER BUNDLE
$99.61 / BUNDLE
IN STOCK Heavy-duty ECT-32 kraft corrugated boxes built for industrial warehouse and fulfillment operations. These 28x28x12 shipping cartons deliver reliable stacking strength and freight efficiency in convenient bundles of 10. Recyclable material supports sustainable packaging practices.
Boxes - Corrugated

28x28x12 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 282812

28 x 28 x 12 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$66.20 / BUNDLE
IN STOCK Professional-grade 28" × 28" × 8" corrugated shipping cartons manufactured from ECT-32 single-wall kraft material. Ships flat in bundles of 10 to maximize storage efficiency and freight savings. Perfect for apparel, books, artwork, and shallow product shipments.
Boxes - Corrugated

28x28x8 ECT-32 Kraft Corrugated Shipping Boxes 10-Pack

PN: 28288

28 x 28 x 8 in ECT-32 Single Wall Corrugated 10 PER BUNDLE
$113.95 / BUNDLE

Product Help Request

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Buying path

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Larger orders

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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 ->