Good size for small and large kids - Mad Rock Chalk Bag - Kid

I bought this for my 5 year old son, who I just introduced to climbing but who didn't want to borrow his sisters' bags. This bag a good size for his hands as he doesn't need much dexterity to get his hands into the opening (i.e. one less thing for him to worry about when learning how to climb). It's larger size also means that it will "grow" with him. To compare, his sisters have a different brand, and their hands at age ~10 years are getting a little crowded for their bag. This will become a limiting factor soon when they can't access chalk while clinging to the wall; adult sized bags are still way too large for their hands.