Stay hydrated during your next ride with the Platypus Tokul X. C. 5. 0 on your back. Fast and light, this pack's design features a breezy, cool, and comfortable RidgeAir backpanel with rigid foam and ventilation channels for cushioning and airflow. Ergonomic shoulder straps ensure a comfortable fit, while the included three liter Big Zip LP reservoir has a low profile shape and wide mouth opening for premium, funky taste free hydration when you're charging up a steep climb. The adjustable waist belt gives you much needed stability when out on your ride, and the helmet carry secures your dome protector when you take a break before descending. Plus, the reflective detailing and attachment point for a blinking safety light both boost your visibility when riding around after dark.