Insulated reservoir and drink tube keep fluids at an ideal temperature for longer; Updated with a universal slider, easy-open reservoir mouth, and hole in connector to hang dry; Wide-mouth opening for easy fill and cleaning/reversing; Durable TPU tubing (PVC free) drapes better over the shoulder while still providing strength and resistance to kinking; Plug-N-Play drink tube disconnect makes refilling and cleaning easy; High-flow bite valve makes hydrating effortless and self-seals to eliminate dripping; Flexible, non-kinking 36" drink tube provides a steady flow; Includes Hydrapak's Beyond Lifetime Guarantee; Can be frozen or filled with hot water (max temperature 60degC / 140degF); Safe and reliable, 100% BPA and PVC free