Disney Little Mermaid Backpack Kids - Bundle with 16" Ariel Backpack, Water Bottle, Stickers, More | The Little Mermaid for Girls. This Disney school backpack set includes a 16” Disney Princess backpack with Ariel artwork, with padded adjustable shoulder straps, and top loop for hanging. Made of durable material, this Ariel school backpack is sure to last and will carry everything you need with you no matter where you go. Sure to be a hit with The Little Mermaid fans of all ages! This Ariel school backpack for teens and adults can double as a travel bag, storage container, and more! This Little Mermaid kids backpack pairs perfectly with all other Disney merchandise.