Features: 1000ml water bladder with volume marking. 0.01 micron hollow-fiber UF membrane filters smallest particles, impurities and turbidity. BPA-free and chemical free, provide clean and safe drinking water. With a lid to prevent leaking and keep the mouthpiece clean and sanitary. Collapses compactly to fit in your pocket, with a carabiner to attach the water bottle to your backpack, convenient to carry. Perfect for traveling, outdoor adventures, emergency preparedness, hiking, backpacking, camping, survival.