A backpack such as this one can be very useful for a number of things. It only comes in one colour, green, but it does look quite neat.
From Trouva
Fjällräven - 25L 614 Patina Green Trekking Abisko Hike Foldsack Backpack
Hardloop
Fjällräven Abisko Hike Foldsack - Walking backpack Patina Green 25 L