The Silva HYDRATION RESERVOIR V 1L bag is compatible with the Silva Strive 5, 10, Strive Light 5,10 and Strive Mountain Pack backpacks. The bag is insulated with Hydrapak IsoBound technology, which keeps the liquid at the ideal temperature 38% longer than standard bags. It is made of durable TPU material without BPA's, can be filled with liquid up to 60°C. Reliable wide Slide-Seal closure, for easy and quick filling and practical maintenance. The recessed self-sealing valve offers fast and smooth water flow.