I've never really had a reason to use one before. But since I'm living with my parents currently and it hit 15 degrees last night, I went for it. I had made one earlier this week using two tp rolls duct taped together and stuffed with 6 dryer sheets. Took all of 2 minutes to make. Anyways, I really needed to smoke last night since I did a little blow earlier that night and there was no way I was sleeping without the ganj. So I figure the best piece would be my little dugout since you can easily cover the bowl and it's easy to clear all of the herb. After a few tokes my room was a lil hazy and smelled very pleasantly of dryer sheets. Whoever thought this up is a god!