4x3x1" White Corrugated Mailers ECT-32-B Crush Resistant - Bundle of 50
$20.82
/ bundle of 50$0.42 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" × 1"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 3" × 1" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 2.88 lb |
| Outer carton (shipping) | 10.75 × 10.0 × 6.0 in |
| LTL freight class | Class 125 |
| GTIN | 841436088350 |
| SKU | M431 |
About this item
SKU M431 — 4" × 3" × 1", ECT-32-B Corrugated, White. Sold as a bundle of 50, shipped from US warehouses.
Common questions
What does ECT-32-B mean, and how does it impact shipping performance?
ECT (Edge Crush Test) 32 indicates the corrugated can withstand 32 pounds of force per linear inch before crushing. The 'B' denotes standard corrugation. This rating is ideal for lightweight fragile items; it balances protection with postage efficiency by keeping overall box weight minimal while maintaining structural integrity under typical warehouse stacking conditions.
How many mailers can fit on a standard pallet, and what's the freight advantage?
The compact 4 x 3 x 1" footprint allows approximately 200-240 bundles (10,000-12,000 mailers) per pallet when optimally stacked. This density reduces per-unit freight costs by 40-50% versus smaller shipments and lowers dimensional weight charges for carriers, directly improving your bottom line on high-volume orders.
Do these mailers require assembly equipment or tape?
No. These are one-piece fold-and-tuck mailers that require zero tape, glue, staples, or equipment. They fold together in seconds by hand, eliminating labor costs and increasing packing speed by 60-80% compared to traditional boxes, making them ideal for high-throughput fulfillment operations.
Are these mailers suitable for heavier items or just lightweight products?
ECT-32-B corrugated is engineered for lightweight fragile items (typically under 2 lbs). The double-wall construction on front and sides provides excellent crush resistance for this weight class. For heavier merchandise, we recommend ECT-44 or ECT-48 alternatives to ensure safe delivery and compliance with carrier requirements.
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.