n2diving

I wasn't suggesting the AL-20's for drysuit.... just for wet suit. I agree the steel cylinders are pretty much the right solution for dry, esp dry with heavy underwear. But steel in a 3 or 5 mil in salt results (for everyone I've seen) in divers with trim who look like they are walking, not swimming.... and their back hurts too. If they are diving wet and want more gas than 13's, the AL-20's are a viable solution that trim out pretty well.