Colorado recently started charging for plastic bags (a good thing imo). However the self-checkouts at all of the stores I've been to simply cannot handle a reasonable workflow. I can't add my personal bags to the bagging area before I start scanning and tare the scale or anything. I either have to do the entire operation in two stages: scanning then bagging, or I have to have the lone employee come over and confirm that I'm not stealing stuff every third item.
Not to mention that the bagging area is not designed for personal bag use really at all.