Re: WTF is this bowl?
I'd be nervous about putting a rubber band to make that seal. I think that it should be fine because the air is dawn from the top of the bowl so its not likely that the air will be drawn through a minute gap in the ring. Thats a funky bowl though, kinda cool. You can wrap the foil around the collar and then if the tobacco burns beyond the point of return, you can lift up the foil and air out/pick tobacco out if need be.
36" Al Falkher Solid - 36" KM Copper Heart Two Hose - 22" Temsah Mini-Wheat(a.k.a. Golden Nugget)