The Thule Vital 8L Hydration Pack is lightweight and expertly designed for high-intensity two to five hour rides with the 2.5 Hydrapak reservoir. Built specifically to improve bike handling and reduce muscle strain, the hydration pack has optimal weight distribution thanks to the low center of gravity. The Thule ReTrakt hydration hose has a unique magnetic design which allows it to automatically snap back in place between sips. This means you can stay hydrated and still keep your eyes on the trail ahead. The hydration pack's lightweight, ventilated materials ensure a comfortable ride, and the 8L storage can hold tools, clothing, food, and other items.