The karrimor refuel 82 daysack is a lightweight hydration bag designed for running cycling and walking and comes with a 2 litre hydration system to ensure that you are kept hydrated while you are on the go the refuel range is available in different sizes and this lightweight 82 is a compact size that is comfortable to wear thanks to the coolmesh contact and refuel ventilated back system and has plenty of storage space still for your essentials and a central expandable section ideal for your he