A more minimalist design is hardly imaginable the light pack 25 is the lightest of the waterproof ortlieb backpacks with a 25 liter payload and a weight of only 290 grams the light pack 25 offers an optimal weight to volume ratio and distinguishes itself in terms of its purist design its proven ortlieb roll closure and its lightweight air permeable straps and when its not needed the minimalist shrinks down and waits in its practical mesh bag for its next mission