Thule expertly designed Vital 3L Hydration Backpack with mountain bikers in mind. This minimalist pack is best for short rides and includes a reservoir to ensure we stay hydrated after a few hours on the bike. Its clever design features a magnetic ReTrakt attachment that pulls the reservoir's hose out of our way while riding and leaves it accessible when we need a pull. There's plenty of room in the backpack for an extra layer, first-aid necessities, and a quick bite.