Youre going to need hydration while on your backcountry hike, so make sure to take this insulated bottle carrier with you on your next adventure. Weighing less than a thermos, it keeps liquids hot or cold and has a reinforced nylon strap that allows it to ride on any backpack. Water resistant, coated nylon fabric. Polyester knit lining. Closed cell foam insulation. EVA molded foam lid and base. Water resistant coated zippers. Reinforced nylon webbing with hookloop attachment. Weighs only 4.3 ounces. Fits Nalgene 1 liter, Cyclone 1 liter, GSI 1 Liter bottles.