Teachers, may I ask what bags do you use?

I carry one of my LV canvas bags, county provided laptop bag, and a heavy duty canvas tote from Trader Joe's. I've been thinking about getting a mon-mono Neverfull GM or an MCM large Liz tote, but I would hate to possibly damage my bag by having it on a tile floor all day. Right now my money might be better spent on another handbag.