# Survivor® Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT

Envelopes expand to provide lightweight, inexpensive shipping for bulky items. Expandable envelopes are made of puncture, tear and moisture-resistant DuPont™ Tyvek® material. Envelopes made with Tyvek® are half the weight of heavy duty paper envelopes, so you save on postage with each mailing.

-   Expandable fit made of rip and water resistant Tyvek material with self seal flap.
-   Strong, lightweight envelopes made of Tyvek® material are half the weight of heavy-duty paper envelopes; save on postage with every mailing.
-   Envelopes made with Tyvek® repel water and resist acids, bases, salts, rot, mildew and stains; perfect for storing taxes and essential papers in the home office.
-   Redi-Strip ® envelopes seal tight to keep contents safe€”just pull and press€”adheres without moisture for a clean, instant seal.
-   Ideal shipping envelopes for clothing, books, binders and big bulky papers.

## Details

- **Price:** 185.34 USD
- **Vendor:** Survivor®
- **Type:** Catalog Envelopes
- **Tags:** 10 x 13 x 1-1/2, Envelope, Envelopes, Expansion, Heavyweight, Letters, Mailer, Mailrooms, Open End Envelopes, Packages, Posts, QUALITY PARK, Receiving, Self-Seal, Shipping, Stationery, SURVIVOR, Survivor Envelopes & Mailers, Tyvek, Tyvek Envelope, Tyvek Envelopes & Mailers, White

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 185.34 USD | In stock |

## Images

- Tyvek Expansion Mailers | 10x13, 100-Count

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> Source: [Bloom Skins](https://www.bloomskins.com/products/heavyweight-18-lb-tyvek-open-end-expansion-mailers-13-1-2-square-flap-redi-strip-adhesive-closure-10-x-13-white-100-ct-1)
> Updated: 2026-08-29