Marvel Avengers Mini Backpack for Preschool Toddlers (11") (Avengers School Supplies Bundle). Deluxe Avengers Backpack for Toddlers features adjustable shoulder straps, zip closure compartment, and top locker loop for hanging. Toddler Backpack measures approximately 11" x 8" x 4" -- the perfect size kindergarten or preschool backpack for back to school. Sure to excite any fan of Avengers and superheroes! Officially licensed Marvel Avengers school supplies products -- for boys and girls alike.