Where is a good place to find waist packs for young children (petite and 5). On line or in stores; looking for one that has a water bottle. The Coleman Kids waist pack was too big. There is a Fisher Price product on "ebags.com" came with several accessories (backpack, etc. not needed). My theory is: if they can walk they can carry. Also, it just needs to be large enough to fit the autograph book, pen, snack with water bottle attached. Thanks!