oops, sorry i didn't respond sooner.
on how to make the paint chip wallet, there are a couple tutorials online. this is the one i used: http://www.jesser.org/crafts.php?id=4
and it actually holds up well with heavy stuff because i interfaced it and sewed over the webbing like, 5000 times. i never usually carry more than 2 big textbooks at a time, but that is true of all messenger bags for me. i'm a weakling, haha.