DC Comics The Flash Backpack for Boys - Bundle with 15" Flash Backpack Plus Water Bottle, Fun Pack, & More | Flash School Bag for Kids. This Flash backpack set includes a 15” backpack with adjustable shoulder straps, zip closure compartment, and top loop for hanging. It features colorful artwork of the Justice League member, Flash. This Flash backpack for kids is the perfect size to carry your notebooks, binders, pens, pencils, and any other Justice League school supplies. Show off your love of The Flash in style. This Flash backpack bundle also includes a Justice League Fun Pack filled with 2 pens, 4 sticker sheets (~75 stickers), 2 decal sheets (14 decals), and 1 poster (8” x 11”). Officially licensed DC Comics backpack set is perfect for kids of all ages, boys and girls alike. Set also includes a Beach Kids water bottle and superhero door hanger.