Vampire Squid wrote:I'm thinking about buying x2 18Litre tanks (not as a twin but because of majority being double-dive). My dive buddy uses two and the only real problem is if you have a Loooooooooooonnnnnnnnnnnnnnnnng walk to the Shore Dive entry (or from exit) - then they can take their toll on your shoulders.
Having used 15L's (single and twinned), I can tell you that both are a pain in the back!! I also found they didnt trim out very nicely, and were quite top heavy. The 18's would be better, being longer.
Plus if you are diving with a buddy who only has AL80's or 12's, you are limited by them anyway. Though in your case, having a (madman) buddy with 18's, thats not an issue