Teenage Mutant Ninja Turtles Backpack for Boys - Bundle with 16” TMNT Backpack, Water Pouch, Stickers, More | TMNT Backpack Kids. This Teenage Mutant Ninja Turtles school backpack features adjustable shoulder straps, zip closure compartment, and top loop for hanging featuring colorful new artwork of the Teenage Mutant Ninja Turtles. The TMNT backpack measures approximately 16" x 12" x 5". This TMNT backpack for kids has plenty of space for TMNT folders, notebooks, and books. The front accessory pocket is perfect for holding TMNT pencils, pens, school supplies, toys, snacks, and more. This durable Teenage Mutant Ninja Turtles backpack for boys and girls also comes with TMNT stickers, a water pouch, a phone wallet, and a Rex-man door hanger! Officially licensed Teenage Mutant Ninja Turtles backpack school set. Pair this with other TMNT school supplies.