The Women's Session 8L is a lightweight, compact hydration pack with dedicated storage for trail essentials. The women's specific fit of this lightweight pack ensures minimal shifting and evenly distributed weight, while the breathable air flow back panel and shoulder straps keep you cool out on the trail by minimizing hot spots. Details: Women's specific fit, 2L/70oz Hydrapak reservoir, phaser bite valve, breathable air flow backpanel and shoulder straps, external attachment straps, fleece lined sunglass pocket, internal organizer pockets, safety light attachment, integrated rescue whistle-sternum strap, limited lifetime warranty. If your bag gets dirty, Dakine recommend hand washing with mild soap (like Nikwax Tech Wash), cold water and a soft bristle brush. If hand washing is not going to do the trick, use a front loader washing machine. To ensure your backpack doesn't get tangled, place inside a pillowcase or mesh bag before washing. Always use cold water, mild soap and run on a gentle cycle. Never bleach your pack. Hang to dry in a warm but shady place, ensuring both inside and out are dry before storing. Dimensions: 488 cubic inches (8 liters), 15.5'' x 8.5'' x 4'' (39 x 22 x 10cm). Material: Nylon, Polyester.