The flag I used had a plastic mast about 5' tall. It fit into a bracket attached to the chainstay. The bracket made it easy to remove the flag for getting through my garage door, and to mount it for the next ride. The flag itself was safety orange, so it was highly visible. I think city traffic commuters would want something like this for an extra measure of safety. I received a lot of interesting remarks about the "funny" flag when I was flying one.