9.5x12.5" White Self-Seal Envelopes, 28lb Paper - Case of 500
$118.45
/ case of 500$0.24 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 1/2" × 12 1/2"
Board / material
28 lb. Paper Stock
Color
White
Freight class
Class 78
Specifications
| Inside dimensions | 9 1/2" × 12 1/2" (L × W) |
|---|---|
| Board / material | 28 lb. Paper Stock |
| Color | White |
| Sold as | Case of 500 |
| Order in multiples of | 1 |
| Case weight | 22.44 lb |
| Outer carton (shipping) | 14.25 × 13.0 × 10.5 in |
| LTL freight class | Class 78 |
| GTIN | 841436091800 |
| SKU | EN1070 |
About this item
SKU EN1070 — 9 1/2" × 12 1/2", 28 lb. Paper Stock, White. Sold as a case of 500, shipped from US warehouses.
The 9.5x12.5" White Self-Seal Envelopes, 28lb Paper is a shipping mailer for documents, catalogs, apparel, small parts, photos, and lightweight e-commerce orders. Listed specs include size 9.5" x 12.5"; white material; 28lb; case of 500. Use it as a mailing envelope, poly mailer, padded mailer, or flat document shipper when the item fits the listed size.
Common questions
Do these envelopes require water or gum to seal?
No. These self-seal envelopes feature a pre-applied adhesive strip protected by a tear-away backing. Simply peel off the tear strip and press the flap down for an instant, reliable seal without any moisture or additional materials needed.
How long does the adhesive stay fresh if envelopes are stored for several months?
The protective tear-away strip keeps the adhesive free from dust and environmental exposure, ensuring a longer shelf life compared to traditional gummed envelopes. When stored in normal office conditions, these envelopes maintain seal reliability for extended periods.
Are these envelopes USPS-compliant for business mail?
Yes. The 9 1/2" x 12 1/2" size and white 28 lb. paper stock meet standard USPS and international postal regulations, making them ideal for domestic and business class mailings without surcharges.
What is the cost advantage compared to traditional gummed envelopes?
Self-seal envelopes reduce labor time by 40-50% since employees don't need moisture or special equipment to seal them. The 500-count case offers bulk pricing efficiency, and the extended adhesive shelf life eliminates waste from dried-out gummed inventory.
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.