Disney Sofia the First Preschool Backpack Bundle Toddler (11") Travel Set. Your little one will be ready for any adventure with this Disney Sofia the First preschool backpack for toddlers travel set! This Disney Junior backpack for toddlers features colorful artwork of Sofia the First. Disney Junior Sofia the First toddler backpack measures 11 inches by 9 inches by 4 inches. Just the right size for preschool children. Zip closure. Adjustable shoulder straps. Top loop for hanging. Great in a Sofia the First back-to-school gift set. Officially licensed Disney Sofia the First toys and games products - for girls and boys alike.