Some insist that the pipe has no impact on flavor. That has not been my experience with all other factors controlled.
Any pipe with a round chamber.
Heh. I do have an "opera pipe" or maybe it's a "theater pipe". Narrow chamber (oblong), smallish, to fit in one's vest or suit pocket, so I was told.Any pipe with a round chamber.
So, the pocket, swivelling-stemmed pipes are out? :P