The Trespass Evolver extending waistbag is a super practical option for your cycling & hiking adventures & has 18 litres of capacity when extended. Featuring a front zipper pocket for the essentials & an upper zip, the bag quickly & easily extends to a backpack to offer more storage space for an extra layer & food. The backpack boasts one main compartment & guarantees comfortable transportation thanks to a carry handle & adjustable, breathable mesh backpack straps.