Designed specifically to help kids stay organized, these rugged and roomy bags have lots of pockets, exterior straps and gear loops that keep everything in place. Made from rugged, water-resistant 600-denier polyester. Adjustable straps that are contoured and padded to ensure a comfortable fit; padded back panel adds extra cushioning. Features an MP3 player pocket cutout for headphone cords. Exterior straps hold a Mackenzie lunch bag securely in place. Exterior side pockets are designed to hold any of our water bottles. Holds a lunch bag, a large notebook, two 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(see photos). size: Rolling Backpack Overall: 13" wide x 7" deep x 18" high Interior: 12.5" wide x 6.5" deep x 17.5" high Exterior Pockets: 3 Exterior Front Panel Pocket: 9" wide x 8.5" high Exterior Side Pocket (2): 7" wide x 6.5" high Interior Pockets: 1 Interior Pocket: 7.25" wide x 3.75" high Shoulder Strap (2): 3" wide x 21−24" long Carrying Handle: 1" wide x 5" long Pull Handle (extended): 5.5" wide x 20" long please read entire listing and look at all pictures before purchasing