Cool sharks help kids stay sharp with a pack that keeps school supplies super organized. Both fun and functional, our rugged and roomy backpacks have lots of pockets, exterior straps and gear loops that keep everything in place. Made from rugged, water-resistant 600-denier polyester. Mini backpack holds a snack, a change of clothes, and a favorite toy. Small backpack Holds a lunch bag, 2 small notebooks, 2 books, and a water bottle. Large and Rolling hold a lunch bag, 1 large notebook, 2 small notebooks, several books, and a water bottle. Rolling backpack features sturdy wheels and straps that can be stored behind a fabric panel when used as a rolling backpack. Small, Large, and Rolling backpacks feature an MP3 player pocket cutout for headphone cords. All backpacks have adjustable straps that are contoured and padded to ensure a comfortable fit; padded back panel adds extra cushioning. Exterior straps hold a lunch bag (sold separately) securely in place. Exterior side pockets are designed to hold our Klean Kanteen water bottles (sold separately). Personalization is available for an additional $7.00.