These bags are made from waterproof nylon. The front small zipper pocket features 3 Insulted bottle holders. Inside the large capacity body is 4 side pockets; 2 zippered pockets, an easy find strap with keyring hook and a back easy access zipper. The body of the bag has a sturdy wire opening that helps with keeping the bag open! There are 2 elastic side pouches, one with a wipe easy access slit. The back has an easy access zipper to the main body, a cell phone zipper and 2 O-ring hooks that can be used to attach the bag to a stroller!