Pink Seersucker Large Backpack11. 5x15 A larger version of our backpack with more room for books and folders and a matching lunch box, of course. Kids as young as 3 can handle this bag if they are required to carry a folder from school to home each day, but it will fit kids all the way up to tween size. Wash Me! All of our items are 100% washable (except for lunch lined items). Throw them in the washer on the delicate cycle, cold water, and lay flat or hang to dry! Monogrammable!!