9x12" White Gummed Envelopes 28lb Paper - Secure Seal, Case of 1000
$221.80
/ case of 1000$0.22 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
9" × 12"
Board / material
28 lb. Paper Stock
Color
White
Freight class
Class 78
Specifications
| Inside dimensions | 9" × 12" (L × W) |
|---|---|
| Board / material | 28 lb. Paper Stock |
| Color | White |
| Sold as | Case of 1000 |
| Order in multiples of | 1 |
| Case weight | 41.58 lb |
| Outer carton (shipping) | 19.25 × 15.0 × 12.75 in |
| LTL freight class | Class 78 |
| GTIN | 50085227414897 |
| SKU | EN1026 |
About this item
SKU EN1026 — 9" × 12", 28 lb. Paper Stock, White. Sold as a case of 1000, shipped from US warehouses.
The 9x12" White Gummed Envelopes 28lb Paper - Secure Seal is a shipping mailer for documents, catalogs, apparel, small parts, photos, and lightweight e-commerce orders. Listed specs include size 9" x 12"; white material; 28lb; case of 1000. Use it as a mailing envelope, poly mailer, padded mailer, or flat document shipper when the item fits the listed size.
Common questions
Are these envelopes USPS compliant?
Yes. The 9 x 12" dimensions meet USPS legal-size specifications. Heavy-duty gummed seals provide the secure closure required for postal processing without additional security tape, reducing mailroom labor costs.
Will the gummed flap fail during high-speed processing?
No. Heavy-duty gumming ensures reliable adhesion through mechanical mail sorting equipment. The 28 lb. paper stock provides structural integrity that prevents flap lifting or separation, making these envelopes suitable for automated mailroom systems.
How does opaque paper improve security?
The opaque 28 lb. paper prevents document visibility from external light sources, protecting sensitive payroll data, legal documents, and financial records. This meets many industry compliance standards without requiring additional inner envelopes.
What is the cost-per-envelope for bulk orders?
Each case contains 1,000 envelopes, delivering cost-effective per-unit pricing for high-volume mailers. Buying cases eliminates smaller packaging markups common in retail envelope sales, maximizing mailroom budgets.
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.