Today I used the bag for the first time while running. Was 43km on the road and have a lot of sweat. When I removed the bag, is I noticed that the black substance is very humid. On the way home I got the bag in a cloth bag and at home he was black. On my clothes luckily nothing is rubbed off. If you wash the bag above all, it's a great part. It fits in a lot and by the stretchable fabric is fixed everything so that nothing rattles when walking and shaking. So really a great part. Washing not forget therefore the 2 points deduction
