Herculink® Flat Envelopes
When you need flat mailing envelopes that combine strength, durability, and a premium look, Herculink® Flat Envelopes deliver. Built with a reinforced fiber weave plus a moisture-resistant barrier, these flat envelopes resist tearing, bursting, and damp conditions. Available in both open-end (catalog) and open-side (booklet)—with Zip-Stick® closures—Herculink Flat Envelopes are ideal for high-volume mailings, graphic design use, and applications where both presentation and protection matter.
The Flat
Herculink Envelopes are sold in cartons of 500 envelopes.
Get flat envelopes that stand up to the challenge. Order Herculink Flat Envelopes for your next mailing—strong, moisture-resistant, print-friendly, with reliable closures. Call 612.867.2121 or email doug@easyenvelopes.com for custom samples or pricing.
Key Features & Benefits
- Reinforced fiber weave + moisture barrier protects from tearing and damp
- Burst & tear resistant for tougher handling
- Clean, bright surface for high quality print and graphics
- Available in both open-end and open-side flats
- Secure closures: Peel-&-Seal / Zip-Stick®
Specifications & Options
| Attribute | Typical Detail |
|---|
| Material / Stock | Reinforced fiber + moisture barrier; commonly Sub-26 weight |
| Styles | Open-End & Open-Side flat / booklet styles |
| Closures | Zip-Stick®, Peel-&-Seal, self-adhesive flap types |
| Sizes | Standard flat sizes such as 9.5×12.5", others available |
| Packaging | Cartons of 500, bulk quantities |
| Printing Compatibility | Ink-jet / laser / custom graphics; high contrast works best |
Best Uses
- Marketing and promotional mailings needing sharp design and presentation
- Documents, brochures, reports shipping flat and needing protection
- Damp or challenging mail environments
- High-volume business use for durable, reliable flats
- Graphics or artwork pieces that require printing fidelity
Frequently Asked Questions
- What is the difference between open-end vs open-side flat?
- Open-end has the flap on the short side (catalog style), open-side/booklet has the flap on the long side—choose based on how your contents are inserted.
- Is Herculink better than regular paper flats?
- Yes—thanks to the reinforced fiber and moisture barrier, it handles rougher conditions and resists damage more than standard paper stock.
- How do I know if printing will look good?
- High contrast and dark inks work best; flat sizes with smooth surfaces and strong closures help maintain print quality.
- Do these flats meet postal flat / large envelope requirements?
- Generally yes—if the size, thickness, and flexibility are within postal guidelines. Always verify with your carrier for your specific size/style.
- Are they recyclable?
- Mostly yes—the paper component is recyclable; barrier components might affect local rules. Check recycling practices in your area.
