4x3x3 ECT-32-B White One-Piece Corrugated Mailers 50-Pack M433
$19.89
/ bundle of 50$0.40 per mailer
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Secure checkout
| Quantity (bundle) | Item-subtotal discount |
|---|---|
| 1–2 | Base item price |
| 3–5 | 3% off qualifying item subtotal |
| 6+ | 5% off qualifying item subtotal |
| Pallet or repeat orders | Get a delivered quote |
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Shipping & returns details
Ships from U.S. warehouses. 30-day returns on unopened stock items.
Shipping cost and timing depend on the product, quantity and destination. Parcel or freight service is used as appropriate. Shipping discounts apply only to qualifying orders and rates.
Standard delivery is to street addresses in the contiguous U.S. Eligible returns must be unused and in original packaging; return shipping may apply.
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Inside dimensions
4" × 3" × 3"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
From our customers
“The packaging is sturdy, well-made, and looks professional. We’re really pleased with the quality.”
“They helped us choose the right packaging for our products and made ordering easy.”
“Ordering was easy, everything arrived as described, and we’ll definitely order again.”
Questions before you order?Talk to us
Specifications
| Inside dimensions | 4" × 3" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 50 |
| Physical units per order increment | 50 (one bundle) |
| 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.