Ideal for fulfillment directors and warehouse managers shipping small, high-value items that require reliable protection without assembly overhead. These 12 x 9 x 4" kraft mailers deliver double-wall crush resistance in a lightweight, one-piece design that reduces labor costs and postage expenses while maintaining professional presentation.
Best For
How to Choose the Right Packaging
Specs at a Glance
| Material | ECT-32-B Corrugated Kraft |
| Dimensions | 12" L x 9" W x 4" H |
| Assembly Method | One-Piece Fold-Together (No Tape/Glue/Staples Required) |
| Bundle Quantity | 50 Mailers Per Bundle |
| Recyclable | Yes |
Common Use Cases
- E-commerce order fulfillment for tools, hardware, and small parts Shipping fragile items including glassware, electronics, and delicate merchandise High-volume direct-to-consumer packaging with postage optimization Secondary protective packaging for retail and wholesale distribution Temperature-sensitive product shipments requiring lightweight, stackable protection
What You'll Receive
- 50 pre-scored, one-piece kraft corrugated mailers (12 x 9 x 4") Ready-to-fold design, no additional assembly materials needed
Shipping & Packaging
Frequently Bought Together
Bundle & Save 5%Frequently Asked Questions
ECT (Edge Crush Test) 32-B represents 32 pounds of crush resistance per linear inch of corrugated edge. This mid-range rating provides excellent protection for small-to-medium items while maintaining lightweight properties that reduce per-unit postage costs, critical for high-volume B2B fulfillment centers managing cost-per-shipment metrics.
Operators pack, fold, and close each mailer in approximately 8-12 seconds with zero additional materials. Traditional taped boxes require 20-30 seconds per unit. At 500+ shipments daily, this design eliminates 2+ labor hours per shift while reducing tape and supplies inventory.
Yes. The double-wall construction on front and sides, combined with ECT-32-B kraft rating, provides crush resistance suitable for glassware, small electronics, and tools. Pair with internal cushioning (bubble wrap, kraft paper) for optimal fragile-item protection in standard shipping environments.
Flat storage reduces warehouse footprint by 85% compared to pre-assembled boxes, freeing high-value shelf space for inventory. A pallet of flat mailers (10,000 units) occupies roughly 12 cubic feet versus 200+ cubic feet for equivalent assembled inventory, delivering measurable ROI on warehouse optimization.
Technical Specifications
| Material | ECT-32-B Corrugated Kraft |
| Dimensions | 12" L x 9" W x 4" H |
| Assembly Method | One-Piece Fold-Together (No Tape/Glue/Staples Required) |
| Bundle Quantity | 50 Mailers Per Bundle |
| Recyclable | Yes |
| Color | Kraft |
| Strength / Material | ECT-32-B Corrugated |
| Dimensions (Internal) | 12"" × 9"" × 4"" (L × W × H) |
Product Downloads
Shipping Information
Outer Carton Dimensions
31.0" × 29.5" × 5.75" (L × W × D)
Unit of Measure
BUNDLE
Qty Per Shipping Unit
50 PER BUNDLE
LTL Freight Class
Class 125
Carrier Eligibility
UPS Ground & Freight Eligible
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