Clean yo rock!
As much as I love going on a hike and seeing chalk marks on problems and going "hell yeah!" I can see why some people don't like them, so this set is awesome! I don't use a bag for mine, so l drilled a hole in the bottom of each one and put a piece of assesory cord through them. Keeps them together and makes you look hiphoppapotamous! Come on people! clean your rock! and your friend's rock with this awesome brush set!
Tip: Take a drill and put holes in the brushes, then run some accessory cord through them, makes it easier to keep track of the damn things.