Lightweight and waterproof, the Sea to Summit Ultra-Sil Dry Bags are made to keep our gear dry and organized inside a backpack or travel duffel. The translucent fabric lets us see the contents easily while the roll-top closure compresses our belongings and protects them with a watertight seal. These bags are not submersible and not intended for paddling and watersports. However, their 2K waterproof rating and seam-sealed construction keep our clothes, sleeping bags, electronics, and other gear dry when we're out backpacking, bikepacking, or traveling.