8x5x4" ECT-32-B Kraft Corrugated Mailers - Crush Resistant, Bundle of 50

$42.32
/ bundle of 50$0.85 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
8" × 5" × 4"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 8" × 5" × 4" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 12.3 lb |
| Outer carton (shipping) | 23.0 × 19.0 × 6.0 in |
| LTL freight class | Class 125 |
| GTIN | 848109047782 |
| SKU | M854K |
About this item
SKU M854K — 8" × 5" × 4", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
Common questions
What is the ECT rating, and how does ECT-32-B perform in stacking scenarios?
ECT-32-B (Edge Crush Test 32) provides robust crush resistance for single and double-stacked pallets up to 40" height. This rating supports 4-5 tier stacking in standard warehouse environments, ideal for regional distribution and cross-dock operations handling moderate-weight shipments.
How much warehouse space and freight cost do these mailers save compared to rigid boxes?
Flat-ship corrugated mailers reduce storage footprint by 85% and lower inbound freight costs by 35-40% versus pre-assembled rigid alternatives. A single pallet holds 2,400 units flat versus 400-600 assembled boxes, dramatically improving inventory turns and logistics efficiency.
Can these mailers be assembled without equipment or additional materials?
Yes. The one-piece fold-and-tuck design requires zero assembly time, no tape, staples, glue, or machinery needed. Operators achieve full closure in 2-3 seconds per unit, eliminating bottlenecks in high-volume fulfillment operations.
Are these mailers suitable for fragile items, and do they meet carrier dimensional weight standards?
Double-wall kraft construction provides excellent fragile-item protection for glassware, tools, and delicate products. At 8x5x4", this mailer offers optimal dimensional weight efficiency for USPS, UPS, and FedEx zone-based pricing, maximizing postage savings on small shipments.
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.



