Evoc fr trail 20l backpackevocs fr trail 20l backpack is a day backpack with back protection and offers an ergonomic fit with plenty of space thanks to a 20 litre capacity with all that space coupled with the fact this backpack can accommodate hydration systems up to 3l the fr trail is an ideal partner for those long bike rides plethora of featuresthis lightweight backpack which only weighs 13kg is a multi award winning backpack that comes with a plethora of features such as a 2 step zi