May 29-June6 is my 2nd trip & family's (1st DH, DS4,DS7). My question is do we need one backpack for all or each a fanny? I don't really know what the kids would put in their's, but I'm sure I'll want my camera, small camcorder(will I really use this?) water bottle, etc. but I don't know if the backpack will get too bulky in the heat? Any advice from veterans?