6x4x3 White Corrugated Mailers ECT-32-B Crush Resistant 50/Bundle
$28.61
/ bundle of 50$0.57 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
6" × 4" × 3"
Board / material
ECT-32-B Corrugated
Color
White
Freight class
Class 125
Specifications
| Inside dimensions | 6" × 4" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | White |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 7.44 lb |
| Outer carton (shipping) | 18.0 × 14.75 × 5.75 in |
| LTL freight class | Class 125 |
| GTIN | 812578008155 |
| SKU | M643 |
About this item
SKU M643 — 6" × 4" × 3", ECT-32-B Corrugated, White. Sold as a bundle of 50, shipped from US warehouses.
The 6x4x3 White 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 6" x 4" x 3"; white material; ECT-32-B; 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 rating mean for my operations?
ECT-32-B (Edge Crush Test 32 pounds per linear inch) indicates these mailers can withstand significant stacking pressure without crushing. This rating ensures safe multi-layer pallet storage, reducing damage during distribution and enabling higher-density warehouse configurations that lower fulfillment costs.
Can I skip tape and assembly supplies with these mailers?
Yes. The one-piece fold-and-tuck design requires no tape, glue, or staples, boxes assemble in seconds by hand or automated equipment. This reduces per-unit assembly labor by 30-50% and eliminates supply chain dependencies on adhesive materials.
Will these mailers work for heavier items or multiple items per box?
These 6" x 4" x 3" mailers are optimized for single lightweight items under 5 lbs due to their ECT-32 rating. For heavier products or volume consolidation, consider larger formats with higher ECT ratings (ECT-44 or ECT-48) available in our product catalog.
How do these mailers affect my dimensional weight charges?
At just 6" x 4" x 3" (72 cubic inches), these mailers fall well under dimensional weight thresholds for most carriers, avoiding billable dimensional weight surcharges. The lightweight paperboard (ECT-32-B) further reduces actual weight, maximizing freight efficiency per pallet and reducing per-shipment carrier costs.
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.