Fit: Have your child try on the bag before you purchase it. The bottom of the bag should meet the lower back, but should not be more than 4 inches below the waistline. The point at which the bag and straps meet should be 1 to 2 inches below the top of the shoulders.Scuddles Toddler Backpack was Designed with that in mind since Scuddles is a Women owned Company we have designed this with you and your child in mind. Weight: When you ve selected the right backpack, make sure you don t overload it. The American Academy of Orthopaedic Surgeons recommends that a backpack should not exceed 15 to 20 percent of a child s body weight, but the American Academy of Pediatrics recommends not exceeding 10 percent.LINING:The Scuddles Back To School Briefcase Will Fit all needs for your cute Toddlers Boy or Girl Kids,with front & side pockets that will keep them organized. Backpack for kids with wheels will make your boy or girl schools hero. BPA AND PHTHALATE FREE MATERIAL:Easy Clean Lining will keep your kids safe with their lunche and meals. Keep arts and Crafts pencils books organized and clean. Kid s lunchtime much playful Comfy straps go easy on little shoulders!. ROOMY INTERIOR WITH EASY CARRY WHEELS: The roomy Bag size: L8.5 x W4.5 x H 12inch main compartment holds all the supplies your preschooler might need, easy-to-clean lining.Your toddler will feel like a big kid with his/ her own mini lunch backpack . THE PERFECT PACK FOR ON-THE-GO!