![Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4430]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/600x600/products/87543/85367/666849__65370.1683127158.JPG?c=1 "Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4430]")
![Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4430]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/1280x1280/products/87543/85367/666849__65370.1683127158.JPG?c=1 "Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4430]")
Product Overview
Expandable mailer made with DuPont Tyvek material delivers the best possible protection at a shipping-cost-saving weight. Inserting and removing contents is easy because of its horizontal, open side orientation. Self-adhesive Redi-Strip closure provides a secure, peel-and-press seal. Clean, crisp look makes a professional impression. [QTY/UOM: 100 / 1CT] [PMS SKU: S016-14430] [Category: OFFICE SUPPLIES/ENVELOPES;Shop All]
![Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4200]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/500x659/products/87538/85362/666887__30278.1683127157.JPG?c=1 "Heavyweight 18 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4200]")
![Lightweight 14 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4610]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/500x659/products/87550/85374/238007__22277.1683127159.JPG?c=1 "Lightweight 14 lb Tyvek Open End Expansion Mailers, #13 1/2, Square Flap, Redi-Strip Adhesive Closure, 10 x 13, White, 100/CT [SKU: QUAR4610]")
![Heavyweight 18 lb Tyvek Open End Expansion Mailers, #15 1/2, Square Flap, Redi-Strip Adhesive Closure, 12 x 16, White, 100/CT [SKU: QUAR4492]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/500x659/products/87546/85370/666892__71160.1683127158.JPG?c=1 "Heavyweight 18 lb Tyvek Open End Expansion Mailers, #15 1/2, Square Flap, Redi-Strip Adhesive Closure, 12 x 16, White, 100/CT [SKU: QUAR4492]")
![Heavy 18 lb Tyvek Open End Expansion Mailers, First Class, #13 1/2, Square Flap, Redi-Strip Closure, 10 x 13, White, 100/CT [SKU: QUAR4210]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/500x659/products/87540/85364/666846__47290.1683127157.JPG?c=1 "Heavy 18 lb Tyvek Open End Expansion Mailers, First Class, #13 1/2, Square Flap, Redi-Strip Closure, 10 x 13, White, 100/CT [SKU: QUAR4210]")
![Heavy 18 lb Tyvek Open End Expansion Mailers, First Class, #13 1/2, Square Flap, Redi-Strip Closure, 10 x 13, White, 100/CT [SKU: QUAR4440]](https://cdn11.bigcommerce.com/s-er447ou6zb/images/stencil/500x659/products/87544/85368/122692__66573.1683127158.JPG?c=1 "Heavy 18 lb Tyvek Open End Expansion Mailers, First Class, #13 1/2, Square Flap, Redi-Strip Closure, 10 x 13, White, 100/CT [SKU: QUAR4440]")