3x3x18 ECT-32-B White Square Mailing Tubes 25-Pack M3318
$25.35
/ bundle of 25$1.01 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
White
Freight class
Class 125
Specifications
| Inside dimensions | 3" × 3" × 18" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 25 |
| Order in multiples of | 25 |
| Bundle weight | 5.86 lb |
| Outer carton (shipping) | 27.75 × 17.0 × 2.75 in |
| LTL freight class | Class 125 |
| SKU | M3318 |
About this item
SKU M3318 — 3" × 3" × 18", ECT-32-B Corrugated, White. Sold as a bundle of 25, shipped from US warehouses.
3x3x18" white mailers in paper stock, packed 25 per pack (SKU M3318); this is a second listing of the same BOX case stock at the same price.
Sized for shipping and fulfillment work; closes with tape or the built-in flap. Order by the pack of 25.
Common questions
Why choose square tubes over traditional round mailing tubes?
Square tubes prevent rolling during transit, reducing product damage and packing errors. They stack efficiently, take up less shelf space, and pack faster, saving labor costs and improving shipping accuracy for B2B operations.
Do these tubes require tape or glue to assemble?
No. These one-piece tubes fold together instantly without tape, glue, or additional materials. Assembly is fast, cost-effective, and reduces waste, ideal for high-throughput fulfillment centers.
What products are best suited for 3 x 3 x 18" tubes?
Ideal for rolled documents, blueprints, posters, artwork, catalogs, promotional materials, and cylindrical items up to 3" diameter. The 18" length accommodates standard letter-size documents when rolled.
Is ECT-32-B corrugated strong enough for fragile items?
Yes. ECT-32-B provides robust crush resistance and edge crush strength suitable for most mailed goods. For extremely fragile items, add interior padding or use multiple tubes for added protection during shipping.
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.