The Thule Vital Women's Bike Hydration backpack has been specially designed with a low center of gravity for ideal weight distribution. Its innovative mouthpiece, the Thule ReTrakt, features a unique magnetic system that allows it to retract automatically after each sip, keeping you hydrated without having to slow down. Comfortable thanks to its lightweight and breathable materials, the Thule Vital Women's Bike Hydration also offers a storage capacity ranging from 3 to 8 liters, ideal for carrying tools, food, and other small gear. Thule Vital Women's Bike Hydration 3L: Dimensions: 21 x 8 x 37 cm Weight: 570 g Volume: 3 liters Materials: 100% nylon Reservoir capacity: 1.75 liters Optimal weight distribution due to low center of gravity Lightweight and ventilated materials Quick-access lined pocket Interior zippered pocket Chest strap Thule Vital Women's Bike Hydration 8L: Dimensions: 23 x 10 x 44.5 cm Weight: 570 g Volume: 8 liters Materials: 100% nylon Reservoir capacity: 2.5 liters Optimal weight distribution due to low center of gravity Lightweight and ventilated materials Quick-access lined pocket Interior zippered pocket Chest strap Thule Vital Women's Bike Hydration - Hydration backpack | Hardloop