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Evolution made them that way ... soIndigoBlue:In a word: drysuit.
Then the answer to the original question becomes: steel 72 tank.
MyDiveLog:I'm not sure I'd call an 80 cubic foot tank 'tiny', but I get your point ... especially with a dry suit and boat diving. Most of my dives are beach dives in a wet suit. After about an hour and a half I start getting a bit water-logged and, in the winter, cold. I also tend to find that, when diving with a buddy, I usually have a lot more air at the end of the dive than they do, so an HP 80 makes sense for me.
MyDiveLog:I'm not sure I'd call an 80 cubic foot tank 'tiny', but I get your point ... especially with a dry suit and boat diving. Most of my dives are beach dives in a wet suit. After about an hour and a half I start getting a bit water-logged and, in the winter, cold. I also tend to find that, when diving with a buddy, I usually have a lot more air at the end of the dive than they do, so an HP 80 makes sense for me.
TROLLLLLLLLLLLLLLLLLLLLLLLLLLL!!!!!!!!!!!!!!!IndigoBlue:I wish that the thickest wetsuits made were 3mms. Then for colder waters, divers would stay out of the water until they could save their pennies for a proper drysuit. Unfortunately capitalism always caters to the market. Even when doing so is less than ideal.