i loved this bag in Lotta Jansdotter's book, "Simple Sewing." when i cut it out, i was afraid it would be on the smallish side, but no. it is very roomy and could easily have more than one pocket inside. i like the front sideways pocket too, i wasn't sure if i would.
next time i will make the handles a bit longer so i can wear it on my shoulder. the other issue i had is that it's not reinforced in any way so it loses its square shape. i did put cardboard in the bottom to give it some stability. it could definitely have something in the sides since i like square bags to not flare out.