3x3x18" Kraft Square Mailing Tubes - No-Roll Design, 25-Pack
$37.04
/ bundle of 25$1.48 per mailer
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 dimensions | 3" × 3" × 18" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 25 |
| Order in multiples of | 25 |
| Bundle weight | 3.58 lb |
| Outer carton (shipping) | 28.0 × 17.25 × 3.0 in |
| LTL freight class | Class 125 |
| GTIN | 848109043401 |
| SKU | M3318K |
About this item
SKU M3318K — 3" × 3" × 18", ECT-32-B Corrugated, Kraft. Sold as a bundle of 25, shipped from US warehouses.
The 3x3x18" Kraft Square Mailing Tubes - No-Roll Design, 25-Pack is a corrugated mailer for books, catalogs, apparel, subscription kits, samples, documents, and small e-commerce orders. Listed specs include inside dimensions 3" x 3" x 18"; kraft material; Bundle 25. The mailer format works when the product needs a presentation-style carton or compact shipping box instead of a standard RSC case.
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.