5x4x3 Corrugated Mailers - ECT-32 Kraft Crush Resistant, 50-Pack
$32.92
/ bundle of 50$0.66 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
5" × 4" × 3"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 5" × 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 | 7.06 lb |
| Outer carton (shipping) | 18.0 × 13.75 × 5.75 in |
| LTL freight class | Class 125 |
| GTIN | 848109008509 |
| SKU | M543K |
About this item
SKU M543K — 5" × 4" × 3", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
The 5x4x3 Kraft Corrugated Mailers ECT-32-B Crush Resistant is a corrugated mailer for books, catalogs, apparel, subscription kits, samples, documents, and small e-commerce orders. Listed specs include inside dimensions 5" x 4" x 3"; kraft material; ECT-32-B; Bundle 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 rating mean, and how does it affect stacking performance?
ECT (Edge Crush Test) 32-B indicates the mailer can withstand 32 pounds per inch of edge crush force. This rating supports safe stacking of 4-6 units high under typical warehouse conditions, making it suitable for fulfillment operations with moderate inventory density and short-term storage.
How much assembly time does the fold-and-tuck design save compared to taped boxes?
One-piece mailers fold and secure in 2-3 seconds with zero assembly supplies needed. For high-volume operations, this eliminates tape gun fatigue, reduces per-unit labor costs by 40-60%, and cuts material overhead since no additional sealing materials are required.
Will these mailers fit standard conveyor systems and packing station workflows?
Yes. The compact 5 x 4 x 3" dimensions and lightweight profile work directly in automated and manual fulfillment lines. Pre-fold capability allows workers to assemble mailers on-demand at packing stations, reducing idle inventory and improving workflow flexibility.
How do flat-shipped mailers reduce my freight and storage costs?
Flat mailers reduce cubic volume by ~85% versus pre-assembled boxes, lowering inbound freight costs and warehouse racking requirements. A pallet of 5,000 mailers occupies roughly 8-10 cubic feet versus 40+ cubic feet for pre-assembled alternatives, directly improving your storage density and supply chain economics.
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.