![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-iqof5nfcfj/images/stencil/600x600/products/35829/35434/666849__01262.1691785415.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-iqof5nfcfj/images/stencil/1280x1280/products/35829/35434/666849__01262.1691785415.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. Heavyweight 18 lb Tyvek. Seam Type: Center; Flap Type: Square; Trade Size: #13 1/2; Security Tinted: No. [QTY/UOM: 100 / 1CT]
![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-iqof5nfcfj/images/stencil/500x659/products/85426/83494/666887__57065.1692634402.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-iqof5nfcfj/images/stencil/500x659/products/35833/35438/238007__96802.1691785416.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-iqof5nfcfj/images/stencil/500x659/products/35832/35437/666892__42784.1691785416.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: QUAR4440]](https://cdn11.bigcommerce.com/s-iqof5nfcfj/images/stencil/500x659/products/35830/35435/122692__40519.1691785415.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]")
![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-iqof5nfcfj/images/stencil/500x659/products/85428/83496/666846__14463.1692634402.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]")