In stock SKU M3318KGTIN 848109043401

3x3x18" Kraft Square Mailing Tubes - No-Roll Design, 25-Pack

Stop wasted space and damaged shipments–these 3x3x18" kraft square mailing tubes won't roll during transit like traditional round tubes. One-piece design folds flat for storage, assembles without tape or glue, and holds items securely. 25-pack bundle of ECT-32-B corrugated construction.
$37.04 / bundle of 25$1.48 per mailer
= 25 mailers · Total $37.04
Request bulk pricing

Ships from the nearest of 5 US warehouses · freight calculated at checkout

30-day returns on stock items · Return policy

Inside dimensions 3" × 3" × 18"
Board / material ECT-32-B Corrugated
Color Kraft
Freight class Class 125

Specifications

Inside dimensions3" × 3" × 18" (L × W × H)
Board / materialECT-32-B Corrugated
ColorKraft
Sold asBundle of 25
Order in multiples of25
Bundle weight3.58 lb
Outer carton (shipping)28.0 × 17.25 × 3.0 in
LTL freight classClass 125
GTIN848109043401
SKUM3318K

About this item

SKU M3318K — 3" × 3" × 18", ECT-32-B Corrugated, Kraft. Sold as a bundle of 25, shipped from US warehouses.

3x3x18" Kraft Square Mailing Tubes - No-Roll Design, 25-Pack. Use this item for shipments or presentation packs where the product fits the listed inside dimensions and closure style. Listed specs include size 3 x 3 x 18 in; material kraft; sold as Bundle 25. Confirm SKU, pack count, price, availability, and checkout delivery before ordering.

Frequently bought with

Common questions

Why choose square tubes over round mailing tubes?
Square tubes eliminate rolling during transit, reducing product damage and customer complaints. They stack efficiently in trucks and pallets, lowering shipping weight and costs. The flat design also maximizes shelf space in warehouses compared to bulky round alternatives.
Are these tubes USPS/UPS/FedEx compliant?
Yes. ECT-32-B kraft corrugated meets all major carrier specifications for dimensional weight, edge crush strength, and burst resistance, ensuring acceptance without additional fees or delays.
Do I need tape or glue to assemble these tubes?
No. These one-piece tubes fold together in 10-15 seconds without any adhesives or tools. The interlocking design ensures secure assembly for immediate packing and shipping.
What products fit safely in a 3x3x18" tube?
Ideal for posters, rolled artwork, blueprints, technical documents, fabric samples, rolled signage, and cylindrical products under 3" diameter. Maximum recommended contents weight is 5 lbs for optimal carrier compliance.

Order support

Questions on specs or freight?

Send the SKU, quantity, and delivery ZIP and we will confirm specs, availability, and freight before you order.

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