12" X 6" X 17" backpack. Made of 600 D polyester. Two styles of these backpacks. 3 solid colors in these backpacks: navy, forest green, and black. 5 two tone: royal blue with black, gray with black, red with black, burgundy with navy, and orange with green. In addition to the main compartment the back packs have two zippered pockets in front for smaller items and padded shoulder straps.