I was never happier than the day I got rid of the BTZ tube. Sticking my head in the rubber coated tube just was plain wrong. I do have a Harrison but use it only on long back-pack trips. I really like my large old-school heavy-weight cotton (weighted w/ steel washers) that I got from Jay Dusard. It's long enough to pull out over the bellows of my old Deardorff and doesn't fly away in the wind. And Frank they're not that finicky.