High Sierra 4L Hydration Pack Backpack - No Bladder High Sierra hydration backpack with a lightweight outdoor design and zip storage pocket. Great for hiking, biking, running, festivals, travel, beach days, theme parks, or outdoor adventures. Can also be used as a small backpack without the hydration bladder. In good pre-owned condition. #camelbak #hydrationpack #hikinggear #backpack #outdoorgear