Transformers Backpack for Kids - Bundle with 15" Transformers Backpack Plus Water Bottle, Tattoos, More | Transformers School Bag for Boys. This Transformers backpack set includes a 15”” backpack with adjustable shoulder straps, zip closure compartment, and top loop for hanging featuring colorful artwork of favorite Transformers characters. This Transformers backpack for kids is the perfect size to carry your notebooks, binders, pens, pencils, and any other Transformers school supplies. Show off your love of Transformers in style. This Transformers backpack bundle also includes Transformers tattoos, making the perfect gift set for any Transformers fan. Officially licensed Transformers backpack set is perfect for kids of all ages, boys and girls alike. Set also includes a Beach Kids water bottle and Rex-Man door hanger.