The Vital Bike Hydration hydration pack from quality brand Thule is specially designed for rides of 1 to 3 hours. The hydration pack has a special ReTrakt system, which allows you to drink without slowing down your ride. After use, the drinking tube automatically goes back into place thanks to the ingenious magnet system. The backpack offers enough space for some extra clothing, food or other items. Thanks to the optimal weight distribution, you use less muscle power while driving. The Hydrapak reservoir has a capacity of 1.75 liters and has enough capacity for a medium ride on the bike. The use of ventilating materials creates a good airflow and you do not perspire on your back. The zipped inner pocket securely stores your phone and other valuables, while the reflective details keep you visible in low light.