Only one tag on my "business" bag, in case it gets lost.
I have a leather carry-all bag which I use when on vacation. It's an old bag; belonged to my dad before he died. He had a few tags on there (old hotel tags, PAA Clipper Club and such) when I got it. I continued the habit. Today, this bag has about 250-300 tags on it. Some of the tags are 30-50 years old. Some are valuable and collectible. From all 7 continents. Airlines, hotels, cruise companies, safari parks. Even the silver tag given out on 10/24/2003, the last flight on Concorde. It actually brings back great memories when I look back at Dad's travel and my own over the last 40 years.
I'm sure some people laugh at me.

But many others, even F/A and pilots, have taken the time to look at the tags and tell some wonderful stories of their own.