I have FT tag on my laptop messenger bag and my current PM on my small roller bag which could be a carry on without a problem, but I don't like having to be carrying more than my laptop bag if I can help it. I need to attach the FT bag to my roller bag, now that I think about it.
I never thought about attaching the Delta Medallion tag to my laptop bag to make it easier to check in at a kiosk. I usually just pull out my SM card from my wallet, though I don't even do that now since I've memorized my SM number.