5x5x3 Kraft Corrugated Mailers ECT-32 Crush Resistant - 50 Pack
$54.40
/ bundle of 50$1.09 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" × 5" × 3"
Board / material
ECT-32-B Corrugated
Color
Kraft
Freight class
Class 125
Specifications
| Inside dimensions | 5" × 5" × 3" (L × W × H) |
|---|---|
| Board / material | ECT-32-B Corrugated |
| Color | Kraft |
| Sold as | Bundle of 50 |
| Order in multiples of | 50 |
| Bundle weight | 7.58 lb |
| Outer carton (shipping) | 20.0 × 15.5 × 5.5 in |
| LTL freight class | Class 125 |
| GTIN | 848109008523 |
| SKU | M553K |
About this item
SKU M553K — 5" × 5" × 3", ECT-32-B Corrugated, Kraft. Sold as a bundle of 50, shipped from US warehouses.
The 5x5x3 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 5" x 5" x 3"; 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 why does it matter?
ECT (Edge Crush Test) 32-lb rating indicates the corrugated can withstand 32 pounds of force per lineal inch before crushing. This mid-tier strength is ideal for small parcels with moderate fragility; it balances protection with cost efficiency for high-volume shipping operations.
Do I need tape or adhesive to seal these mailers?
No. The one-piece fold-and-tuck design requires zero tape, glue, or staples. Simply fold the flaps together, the structure self-locks. This eliminates supply costs and reduces packing time by approximately 40% versus traditional boxes.
How much weight can a 553 mailer handle in stacking scenarios?
ECT-32-B corrugated supports approximately 8-12 lbs per mailer when stacked 4-5 units high in a warehouse setting. For heavier items or higher stacks, upgrade to ECT-44-B or ECT-48-B variants. Consult our freight engineering team for custom load calculations.
What's the postage savings versus heavier corrugated alternatives?
Kraft ECT-32-B mailers weigh 60-70% less than ECT-48-B equivalents, reducing USPS and UPS dimensional/actual weight charges. For 1,000-unit monthly volumes, typical savings range $200 - $400 depending on shipping zone and carrier selection.
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.