Herculink Expansion Envelopes
When flat envelopes won't do, Herculink Expansion Envelopes give you the extra depth for bulky materials—without sacrificing durability or presentation. Built with a reinforced fiber weave beneath a paper outer layer plus a moisture-resistant barrier, these expansion envelopes handle heavy loads, protect against rough handling, and offer secure closure options like Zip-Stick®. Available in both open-end and open-side styles, these mailers are ideal for catalogs, components, multi-page documents, or anything that needs space and strength.
The Expandable Herculink® envelopes are sold in cartons of 100 or 250 envelopes.
Need mailing envelopes that grow with your content? Choose Herculink Expansion Envelopes for strength, space, and professional presentation. Call 612.867.2121 or email doug@easyenvelopes.com for custom samples or pricing.
What Makes Them Special
- Deep gussets allow for thick contents like catalogs, samples, or bundled materials.
- Integrated fiber weave plus moisture barrier under paper for added strength and resistance.
- Secure closures: Zip-Stick® or Peel-and-Seal.
- Available in both open-end and open-side styles (choose based on loading needs).
- Print friendly outer stock works well for branding or shipping labels.
Specifications & Options
| Feature | Details |
|---|
| Material | Herculink reinforced fiber with moisture barrier under paper layer |
| Typical Sizes | 9×12×2″, 10×13×1-2″, 12×16×2″ (open-end or open-side) |
| Stock Weight | Sub-26 or similar sturdy stock |
| Closure Styles | Zip-Stick®, V-Bottom style folds |
| Orientation | Open-End (short edge flap) or Booklet/Open-Side (long edge flap) |
| Carton Quantities | 100 or 250 envelopes per carton |
Best Uses
- Bulk, multi-page marketing or sample kits
- Documents + inserts that are too thick for standard flats
- E-commerce shipments with flat but bulky items
- High value or premium mail where presentation & protection matter
- Environments exposed to moisture or rough handling
FAQ
- What’s the difference between open-end vs open-side?
- Open-end has flap on the short side, open-side has flap on long side—choose based on how you load content.
- How thick can these envelopes expand?
- The “x-inch” expansion (1-2″ etc.) indicates how much space the gusset gives—use enough depth for your contents without overstuffing.
- Will printing show up well?
- Yes—outer paper surface of Herculink works nicely for logos, shipping info, and graphics. Try test print for best results.
- Are they good for moist or humid climates?
- They offer more resistance than plain paper due to internal barrier, but avoid heavy water exposure for longevity.
- Do they cost more to send through mail?
- Possible—they are thicker and heavier—but using one strong expansion envelope often saves cost vs multiple narrow or overstuffed flats and damage costs.
