4x4x1 Kraft Corrugated Mailers ECT-32-B, 50-Pack
$26.88
/ bundle of 50$0.54 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" × 1"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 4" × 4" × 1" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 3.44 lb |
| Outer carton (shipping) | 13.25 × 11.75 × 6.0 in |
| LTL freight class | Class 125 |
| GTIN | 848109008578 |
| SKU | M441K |
About this item
SKU M441K — 4" × 4" × 1", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
Common questions
What is ECT-32-B and why does it matter for my shipping operation?
ECT (Edge Crush Test) 32 means each linear inch of corrugated can resist 32 lbs of crushing force, ideal for stacking 6-8 boxes high without damage. The -B indicates two-ply construction, providing double-wall protection on the front and sides. This specification balances maximum durability with lightweight postage savings, reducing dimensional weight charges by 40-60% versus heavier alternatives.
How much assembly labor time do I save with the one-piece fold-and-tuck design?
Each mailer folds in 2-3 seconds with zero additional materials. Processing 50 boxes takes under 3 minutes. Compared to tape-sealed alternatives, you eliminate tape application steps and waste, reducing labor costs by $0.02-0.05 per unit at scale, delivering $1,000+ annual savings for high-volume fulfillment centers.
Will these mailers protect fragile items during transit?
Yes. The double-wall crush-resistant construction and fold-to-tuck design create a secure, rigid box that protects against impacts, pressure, and compression. The 4 x 4 x 1" size is engineered for small fragile items (glassware, electronics, tools). However, we recommend interior cushioning (air pillows or kraft paper) for high-value or extremely delicate items.
How do flat-shipped boxes reduce my warehouse costs?
Flat boxes consume 85% less storage space than pre-assembled mailers. A pallet of 1,800 flat boxes occupies 4 sq ft; assembled equivalents require 25+ sq ft. This reduces rent per unit by $0.03-0.10, improves inventory turns, and eliminates dead storage, critical for fulfillment centers operating on tight margins.
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.