MATERIALS This BPA free 2 liter hydration bladder uses safest drinkware materials of high quality. The bladder is made of thick TPU (Thermoplastic Polyurethane) material that's pressure & wear resistant. TPU is a superior material than EVA, which most other brands use. It has greater softness & flexibility, higher resistance to stretching & tearing, and is more pressure tolerant. TPU also has higher washability & greater resistance to temperature changes, making this bladder an ideal choice. TUBE CAN BE DETACHED WHEN FULL The bladder holds water even with the tube is removed. This makes it easy to place the bladder in an icebox, refrigerator, etc. The QUICK RELEASE connector mechanism lets you attach and detach the hose with a single click no hassle with trying to screw it on the reservoir bag! The INSULATED TUBE COVER provides additional value! Our neoprene insulation resists temperature changes in different outdoor climates - hot and cold. REMAIN PEFECTLY HYDRATED This 2L water reservoir can withstand temperatures from -20 to 50 degrees Celsius. The tube resists temperature changes in hot and cold weathers. L 14.2'' x W 6.8'' hydration bladder is compatible with most hydration packs. The tube (0.4 diameter, 40 long) provides a wholesome flow for easy drinking, keeping you hydrated when biking, cycling, hiking, or running!