comments:
ArcaneAddiction posted on r/evilautism19w
This is the bag I have. It's pretty big, but I have a lot of stuff in my purse (I call it my bag of horrors), and I can randomly stuff food or water bottles in it if I need to. Mine is 12x15 inches. Something like this might work for you. It's 10x11 inches. For the record, I'm only 5'1". Mine is a little bulky when full, but if it's not stuffed to the brim, it's still comfortable.