Evoc fr trail unlimited 20l backpackthe fr trail unlimited is a versatile daypack with plenty of storage space and some great features including an integrated back protector that can also be worn separately with a neutrally balanced load distribution the fr trail unlimited can be used on or off the bike with a minimum of fuss evocs air flow contact system allows the fr trail to be positioned in such a way that theres optimal ventilation for the back and shoulders together with a neutral lo