Ju-Ju-Be Midi Backpack - Mischief Managed Harry Potter. Looking for a backpack so lightweight your kids could use it for school, yet so organized youíll want it for all-day outings with baby? You need the all-purpose Midi Backpack! This structured backpack is the affordable, durable, super adorable mid-sized backpack in the JJB lineup! The Midiís adjustable straps, five pocket stash-capacity, and two elasticized bottle pockets offer you a full dayís worth of packing (and comfortable carrying!) no matter what your busy day holds. With its attractive, versatile design, you just might find you need a Midi Backpack for every member of the family! Stain resistant fabric & machine washable & air dry.