Loungefly x Disney The Little Mermaid Ariel Square Nylon All Over Print Backpack. This backpack includes all-over printed details of Ariel and Flounder. The side pockets are very roomy and can fit most hydration bottles W: 11.5" X H: 17.5" X D: 5". New with tags. Please note, that patterns will vary with all-over print styles. Not every piece will look identical as to what is pictured here. All measurements are in inches & are approximations.