4x4x3 Corrugated Mailers - ECT-32 Kraft Crush Resistant, 50-Pack
$30.91
/ bundle of 50$0.62 per mailer
Request bulk pricing
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
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 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 | 6.18 lb |
| Outer carton (shipping) | 18.25 × 12.75 × 5.75 in |
| LTL freight class | Class 125 |
| GTIN | 841436082549 |
| SKU | M443K |
About this item
SKU M443K — 4" × 4" × 3", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
Ship small, fragile items safely with ECT-32-B kraft corrugated mailers featuring crush-resistant double-wall construction on front and sides. These one-piece folding mailers require no tape, glue, or staples, assembly takes seconds. Bundle of 50 ships and stores flat to maximize warehouse efficiency and reduce freight costs.
Ideal for shipping apparel, books, mugs, accessories, gifts, and small fragile items. A sturdy, reliable choice for small-business, Etsy, and ecommerce shippers.
Common questions
What ECT rating is this mailer and why does it matter?
ECT-32-B provides 32 lb edge crush test strength, ideal for small parcels under 5 lbs. This rating balances crush resistance with cost efficiency, protecting fragile contents while keeping per-unit packaging expenses competitive for high-volume fulfillment operations.
Do these mailers require tape, glue, or staples?
No. The one-piece fold-and-tuck design assembles in seconds without adhesives or fasteners, reducing assembly labor and material costs while improving packing consistency and speed in high-volume warehouse environments.
How much space do 50 mailers take up in storage?
Since all mailers ship and store flat, a bundle of 50 requires minimal warehouse space compared to pre-assembled boxes. This flat-storage advantage reduces inventory footprint by up to 80%, freeing shelf space for faster inventory turnover.
Is this kraft mailer eco-friendly and recyclable?
Yes. 100% kraft corrugated material is fully recyclable and meets ESG packaging standards. Using these mailers supports your sustainability commitments while maintaining professional, branded unboxing experiences for end customers.
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.