MINI Backpack: Designed to fit books, snacks, tablets, toys and more. This simple backpack design will have your kids excited to head off to school and playdates. It is also a perfect silhouette for teens and adults who need to carry their daily essentials in a smaller backpack. MIDI Backpack: Designed to fit school supplies such as folders, binders, tablets and laptops. Roomier than the MINI, the MIDI has many internal & external pockets including a side bottle pocket.