I use what can only be described as a midget messenger bag from Dickies. It only measures about 7x5x3 but it fits everything neccessary for a day at Disney but it is small enough the you can't put random stuff in there that would weigh you down. I usually keep my phone, camera, wallet, chapstick, change purse, small bottle of hand sanatizer and a small tube of sunscreen in it with no problem. However I am forced to put DFi cell phone and wallet in there as well when going on wet rides because the inside is linded and waterproof. It has a really long strap that is adjustable and the clasp on the front is one of those plastic things that you have to squeeze both sides and pull to open it so I am never worried about stuff falling out. I also use the clasp to hook a bag onto when I am tired of carrying it. I have had this for a couple of years so it may not be out anymore but I got it at Mervyn's and I love it, it is my Official Disney Bag!