6x4x3 ECT-32-B Kraft Corrugated Mailers 50-Pack M643K
$39.50
/ bundle of 50$0.79 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
6" × 4" × 3"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 6" × 4" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 7.42 lb |
| Outer carton (shipping) | 18.0 × 14.75 × 5.5 in |
| LTL freight class | Class 125 |
| SKU | M643K |
About this item
SKU M643K — 6" × 4" × 3", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
6x4x3" kraft corrugated mailers in ECT-32-B corrugated board, packed 50 per pack (SKU M643K); 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 needs?
ECT (Edge Crush Test) 32-B indicates the corrugated board can withstand 32 pounds of force per linear inch before crushing. This rating ensures reliable protection under typical stacking and transport conditions, making it ideal for fragile items and multi-tier warehouse operations without cost premiums.
How quickly can my team assemble these mailers during peak fulfillment?
These one-piece mailers fold together in seconds with zero fasteners, no tape, glue, or staples required. A single operator can prepare 300+ mailers per hour, dramatically accelerating packing line throughput during peak seasons.
Will these mailers reduce my per-package shipping costs?
Yes. The lightweight kraft construction and compact 6 x 4 x 3" footprint lower dimensional weight charges, while flat-ship storage eliminates assembly labor and inbound freight waste. Most operations see 8 - 15% postage savings versus rigid or heavier alternatives.
Can I stack these mailers during storage or transit without damage?
Absolutely. ECT-32-B kraft corrugated provides excellent stacking performance when flat-stored or when assembled. The double-wall construction on front and sides protects contents under realistic warehouse stacking loads while maintaining structural integrity throughout the supply chain.
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.