4x3x3 ECT-32-B White One-Piece Corrugated Mailers 50-Pack M433
$18.59
/ bundle of 50$0.37 per mailer
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Ships from the nearest of 5 US warehouses · freight calculated at checkout
30-day returns on stock items · Return policy
Inside dimensions
4" × 3" × 3"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 3" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 5.06 lb |
| Outer carton (shipping) | 16.0 × 10.75 × 5.5 in |
| LTL freight class | Class 125 |
| SKU | M433 |
About this item
SKU M433 — 4" × 3" × 3", ECT-32-B Corrugated, White. Sold as a bundle of 50, shipped from US warehouses.
4x3x3" white corrugated mailers in ECT-32-B corrugated board, packed 50 per pack (SKU M433); 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 50.
Common questions
What does ECT-32-B mean, and is it strong enough for fragile items?
ECT-32-B denotes 32 ECT (Edge Crush Test) rating with B-flute corrugation, rated for items up to 5 lbs with crush resistance. Double-wall construction on front and sides protects fragile goods like electronics, glass, and ceramics during transit without additional cushioning materials.
How much labor time does the fold-and-tuck design save versus standard boxes?
One-piece mailers fold together in seconds with no tape, glue, or staples required. Most operations report 60-70% reduction in packing labor per unit compared to traditional boxes, directly lowering fulfillment costs at scale.
Will these mailers stack safely in my warehouse?
Yes. Flat-folded mailers are crush-resistant and stack 6-8 cases high without deformation. This enables 60% greater storage density than pre-assembled boxes, maximizing warehouse footprint efficiency.
Are these boxes suitable for heavy or oversized items?
No. The 4x3x3" size and ECT-32-B rating are designed for lightweight items under 5 lbs. For heavier shipments, we recommend 4x4x4" or larger dimensions with higher ECT ratings (ECT-44 or ECT-48).
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.