From waist bag to rucksack in the flash of a zip! ‘ Evolver’ is perfect for any adventurer who needs more flexibility from a rucksack. Lightweight & comfortable to wear, this transforming bag will keep your essential possessions safe & dry on any outdoor journey. Waist Bag Extends to Rucksack 18 Litre Capacity Front Storage Pocket Reflective Strip on Front Lightweight Mesh Shoulder Strap & Waist Belt