A very clever reimagining, the Piorama Adjustable Backpack is three backpacks in one. The smart design allows for it to be surreptitiously expanded--or contracted--between 31-62 liters, with no excess material on show, meaning it can be used for the gym, weekend breaks and backing trips, or all combined. Forged from 900D nylon, it's tough and water-resistant, with padded shoulder straps and ample slots to keep your devices secure.