The Little Mermaid Backpack for Kids Set - Bundle with 15" Ariel Backpack, Stickers, Water Bottle, More | Disney The Little Mermaid Backpack for Girls. This Little Mermaid school bag bundle includes one 15" backpack with adjustable shoulder straps and top loop for hanging featuring colorful artwork of Ariel and Flounder. Show off your love of Ariel in style! This Little Mermaid backpack is sure to be a hit with Disney fans of all ages and is perfect to take with you to school, on vacation, or anywhere else. This Little Mermaid backpack and travel set also includes Disney Princess stickers, a Beach Kids pink water bottle, and a Beach Kids princess castle door hanger. Officially licensed Disney The Little Mermaid backpack manufactured by Fast Forward is perfect for Ariel fans of all ages, boys and girls alike.