Dakine Grom 13L Backpack Adjustable sternum strap with safety whistle Fleece-lined sunglass pocket Cargo straps and bungee storage This thoughtfully designed kids' sized backpack features a lower 13L (790 cubic inch) volume for lighter loads, plus safety features including reflective details and an easily accessed safety whistle on the adjustable sternum strap. An external bungee strap holds additional layers, while dual mesh side pockets hold water bottles, snacks, or other quick access items.