3x3x37 White Square Mailing Tubes 25-Pack M3337
$45.16
/ bundle of 25$1.81 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" × 37"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
Specifications
| Inside dimensions | 3" × 3" × 37" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 25 |
| Order in multiples of | 25 |
| Bundle weight | 11.7 lb |
| Outer carton (shipping) | 46.25 × 17.0 × 3.0 in |
| LTL freight class | Class 125 |
| SKU | M3337 |
About this item
SKU M3337 — 3" × 3" × 37", ECT-32-B Corrugated, White. Sold as a bundle of 25, shipped from US warehouses.
3x3x37" white mailers in paper stock, packed 25 per pack (SKU M3337); 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 round mailing tubes?
Square tubes eliminate rolling and shifting during transit, reducing damage claims and customer returns. They stack and pack more efficiently, maximizing pallet density and reducing shipping weight per order. For your warehouse team, square design means faster, neater packing, no more chasing round tubes across the shipping dock.
What is ECT-32-B corrugated, and is it strong enough for my shipments?
ECT-32-B (Edge Crush Test 32) is a medium-duty corrugated standard proven for lightweight to mid-weight rolled items like documents, textiles, and artwork. It provides excellent puncture resistance and compression strength while keeping material costs competitive, ideal for high-volume shippers.
How long does assembly take, and do I need special equipment?
No tools, tape, or glue required. Each tube folds together in 2-3 seconds by hand. Your team can assemble boxes at packing stations without slowing workflow, significantly reducing labor costs compared to traditional taped or glued alternatives.
Can these tubes accommodate items longer than 37 inches?
No, the 37" length is the internal dimension. For longer items, we recommend our 42" or 48" square tube options. Contact our packaging consultants to find the ideal tube height for your exact shipping needs.
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.