I made four of these Amy Butler Birdie Sling bags for my graduating Laurels.
I took Math 97 FIVE times in order to graduate from BYU.
Anyway, I did my own thing on the inside. Like a key loopy above the slide in pockets. (Large enough to hold an assortment of pens, because REALLY, I need at least 4 colors of pens to function.
On the other side I put a LARGE zipper pocket (because sometimes you have a secret) and a cell phone pocket.