Turn your NRS dry bag into a soft cooler with the Cool Liner! Reflective Mylar and closed-cell foam - just add ice. These liners fit inside small, medium, large and X-large NRS Ricksacks, Tuff Sacks, Super Tuff Sacks, Round Bottom Sea-Stows and Dri-Stow dry bags. Same reflective Mylar and closed-cell insulation as the NRS DuraSoft Coolers, for great cold retention. Come with a closed-cell foam lid, to seal in the cold. Great for the beach, picnic, concert or day trip. Heck, you've already got the dry bag. Slide in the Cool Liner, add your ice, beverages and food. Fold the bag closure down, clip it in place and you're ready to go. They're not H2Otight; but, hey - the bag is H2Oproof, so no outside leakage occurs. Fool your friends - "Naw, it's only my clothes. That sloshing sound? Just my mouthwash."