Fjallraven Ulvo 23L Backpack in black . New without tags. Never used. Fjallraven Ulvo 23 backpack Color: Black Volume: 23L Details in photos Versatile daypack with zippered opening and padded computer compartment. Fjällräven’s Bergshell fabric is water resistant enough to manage most situations – at the same time as 100% recycled nylon makes green hearts beat a little faster. Simple to pack and just as suitable for light treks and travelling as for everyday commuting.