I made something! No, really. We were having a hard time finding a backpack we liked for Maggie, and John had the idea that a messenger bag would be easier for her to deal with. So, I ended up making her one! She picked out the Hello Kitty fabric at Jo-Ann (it's actually flannel, which I somehow did NOT realize, but it worked fine). I used black duckcloth for the bag exterior, with heavy stabilizer basted on.
I based the bag on this kid's messenger bag tutorial by Zaaberry, but I enlarged it so she can fit a folder inside - this is for Kindergarten, after all. It looks huge on her, but the folder fits just right.
Here are the measurement changes I made:
Main bag pieces: 16x13 inches
Flap: 13.5x12 inches
Strap: 31 inches long
I used the Hello Kitty fabric on the inside, too. There's no pocket (I'll make her a little zippered pencil bag) but I did add velcro closures to the front of the bag and the flap.