6 x 3 3/8" Kraft Gummed Envelopes 28lb - Secure Seal, 5000/Case
$524.40
/ case of 5000$0.10 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" × 3 3/8"
Board / material
28 lb. Paper Stock
Color
Kraft
Freight class
Class 78
Specifications
| Inside dimensions | 6" × 3 3/8" (L × W) |
|---|---|
| Board / material | 28 lb. Paper Stock |
| Color | Kraft |
| Sold as | Case of 5000 |
| Order in multiples of | 1 |
| Case weight | 42.88 lb |
| Outer carton (shipping) | 18.75 × 15.0 × 13.25 in |
| LTL freight class | Class 78 |
| GTIN | 85227506627 |
| SKU | EN1038 |
About this item
SKU EN1038 — 6" × 3 3/8", 28 lb. Paper Stock, Kraft. Sold as a case of 5000, shipped from US warehouses.
The 6 x 3 3/8" Kraft Gummed Envelopes 28lb - Secure Seal is a shipping mailer for documents, catalogs, apparel, small parts, photos, and lightweight e-commerce orders. Listed specs include size 6" x 3 3/8"; kraft material; 28lb; case of 5000. 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 tape or additional adhesive?
No. The heavy-duty gummed flaps activate with water or a sponge applicator, providing a permanent seal without tape, staples, or glue, reducing material costs and improving sealing speed in high-volume operations.
Are the kraft envelopes opaque to prevent content visibility?
Yes. The opaque kraft paper design prevents viewing of contents in transit, ensuring confidentiality for cash, coins, checks, jewelry, and sensitive documents while maintaining a professional appearance.
What industries typically use 6" x 3 3/8" gummed envelopes?
Banks, credit unions, retail stores, nonprofits, and churches commonly use this size for coin deposits, change management, offerings, donations, and small-item shipments. The compact size balances capacity with cost efficiency.
How does bulk purchasing in cases of 5,000 improve my costs?
Buying full cases eliminates per-unit markup, reduces shipping costs per envelope, and ensures consistent inventory for predictable mailroom operations. Most businesses reorder cases quarterly, minimizing storage overhead.
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Questions on specs or freight?
Send the SKU, quantity, and delivery ZIP and we will confirm specs, availability, and freight before you order.