Teenage Mutant Ninja Turtles Mini Backpack for Kids Set - Bundle with 11" TMNT Backpack, Stickers, Water Bottle, More | TMNT Backpack Preschool. This mini Teenage Mutant Ninja Turtles school bag bundle includes one 11" backpack with adjustable shoulder straps and top loop for hanging featuring colorful artwork of favorite TMNT characters Leonardo, Donatello, Michelangelo, and Raphael. Show off your love of Teenage Mutant Ninja Turtles in style! This TMNT mini backpack is sure to be a hit with TMNT fans of all ages and is perfect to take with you to school, on vacation, or anywhere else. This TMNT backpack and travel set also includes a white Beach Kids water bottle and Rex-Man stickers. Officially licensed Teenage Mutant Ninja Turtles backpack manufactured by Fast Forward is perfect for TMNT fans of all ages, boys and girls alike.