Household: Preschooler, LL Bean

Backpacks for Preschooler

I'm pretty sold on getting a backpack from LL Bean for my 3 year old. She's starting preschool in the fall. She's very petite for her age (30 lbs and 39 inches). I'm having a hard time deciding if I should get the Junior Backpack or the regular sized one. Does anybody have any experience with either? Edited to add: She won't have to take a lunch or anything next year, but she will have to take snacks and I imagine some type of folder. Not to mention bring home all of her crafts. She also has to have an extra set of clothes, including...