4x4x4 Kraft Corrugated Mailers - ECT-32 Crush Resistant, Bundle of 50
$37.56
/ bundle of 50$0.75 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" × 4"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 4" × 4" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 7.04 lb |
| Outer carton (shipping) | 19.0 × 12.75 × 6.0 in |
| LTL freight class | Class 125 |
| GTIN | 848109008592 |
| SKU | M444K |
About this item
SKU M444K — 4" × 4" × 4", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
The 4x4x4 Kraft Corrugated Mailers - ECT-32 Crush Resistant is a corrugated mailer for books, catalogs, apparel, subscription kits, samples, documents, and small e-commerce orders. Listed specs include inside dimensions 4" x 4" x 4"; kraft material; ECT-32; bundle of 50. The mailer format works when the product needs a presentation-style carton or compact shipping box instead of a standard RSC case.
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 does ECT-32-B mean, and how does it compare to other corrugated grades?
ECT (Edge Crush Test) -32-B indicates a 32 lb/in crush rating with B-flute corrugation, the standard for small parcel mailers. This grade handles typical small-item loads (under 5 lbs) with reliable stacking performance in warehouse environments while maintaining cost efficiency at scale.
Do these mailers require tape, glue, or staples to close?
No. The fold-and-tuck design allows mailers to assemble and close in seconds with zero additional materials. This accelerates packing speed, eliminates supply chain dependency on adhesives, and reduces fulfillment labor costs per unit.
How much space do these save compared to pre-assembled boxes?
Flat-shipped mailers reduce inbound dimensional weight by 70-80% versus pre-assembled boxes, lowering freight costs significantly. A pallet of 4,000 units (80 bundles) occupies minimal warehouse space, freeing capacity for higher-velocity SKUs.
Are these mailers suitable for stacking during storage?
Yes. The ECT-32-B kraft corrugated provides reliable crush resistance for stacking flat bundles in warehouses. Individual assembled mailers also stack securely on pallets, maintaining product integrity throughout the fulfillment cycle.
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.