The HydraPak Seeker 3L Water Bag is anything but an ordinary bottle. It's a sophisticated, portable hydration system. Made from abrasion-resistant TPU, the Seeker 3L is incredibly durable yet flexible enough to collapse down into its storage bag. Equipped with a leakproof 42-millimeter screw cap, this bottle accommodates threaded backcountry filters. A coated, weather-resistant, low-profile handle makes carrying the Seeker 3L both effortless and efficient. This collapsible water bottle is also 100% PVC- and BPA-free and can hold frozen and hot water up to 140 degrees Fahrenheit.