4x4x3 ECT-32 White Corrugated Mailers 50-Pack M443
$25.58
/ bundle of 50$0.51 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" × 4" × 3"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 4" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 6.02 lb |
| Outer carton (shipping) | 18.0 × 12.75 × 6.0 in |
| LTL freight class | Class 125 |
| SKU | M443 |
About this item
SKU M443 — 4" × 4" × 3", ECT-32-B Corrugated, White. Sold as a bundle of 50, shipped from US warehouses.
4x4x3" white corrugated mailers in ECT-32 corrugated board, packed 50 per pack (SKU M443); 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 why does it matter for my shipping operation?
ECT (Edge Crush Test) 32-B indicates the corrugated can withstand 32 pounds of edge crush force. This rating ensures the mailer resists crushing during multi-level stacking in warehouses and on trucks, reducing damage claims and protecting your reputation. ECT-32-B is standard for small parcel and lightweight item protection.
How much labor do I save with fold-and-tuck versus tape-sealed mailers?
One-piece mailers deploy in 2-3 seconds per unit with zero assembly steps. A typical 500-unit daily volume saves 25+ labor minutes compared to tape-sealed boxes. Over a year, that's 100+ hours of fulfillment labor recovered, significant for high-volume operations managing per-unit fulfillment costs.
Will these mailers stack properly on a pallet without collapsing?
Yes. ECT-32-B construction is rated for stacking loads typical of pallet configurations. Filled mailers can safely stack 8-10 levels high, depending on product weight. Always confirm final stack height with your specific product weight to optimize pallet density and freight efficiency.
Can I use these for international shipping, and are they compliant with carrier standards?
Yes. White corrugated mailers meet USPS, UPS, and FedEx dimensional and material standards for domestic and international parcel service. The recyclable white exterior also supports sustainable shipping credentials if your brand markets eco-friendly logistics.
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.