@maple could you look at bags that have straps where you can convert from shoulder to backpack, back and forth?

i have one of those that i'm covering with pins, i've been real happy with it, i don't think it could fit a laptop however but it's likely they make laptop bags with the same sort of strap scheme. all you have to do is pull the straps slightly different, no unhooking/rehooking up stuff. it's useful as shit