The Evoc Hip Pack Hydeation Pack is Offering optimised back ventilation, the Evoc Hip Pack 3l is perfect for bike rides with little equipment.  Thanks to the venti flap system you can individually adjust the distance of the fannypack to your back and the ventilation along the back panel. With the bladder included, you also have the perfect, small hydration pack. Evoc Hip Pack Hydeation Pack Features Air flow contact system offers perfect back ventilation Accommodates hydration systems up to 1,5 l Tool compartment (separate, quick-access) Hydration bladder 1.5l