I bag my mare's tail for several reasons. She yanked out a big chunk a while back so it's currently cut short. I wash her tail really well once a week, let it dry while she eats or I groom her, then I put in MTG, braid it up, and bag it. In a week, I'll repeat the process. I probably keep it out of the bag for about a week every two months. It's mostly bagged because the grease from the MTG gets on her butt, and then dirt sticks to it, and she ends up with a nasty, grime-covered rear when it's supposed to be white.