So I was told that my fathers day present was a pony bottle that I had been talking about and that I needed to go pick it out lol. Now I'm having second thoughts. I like the idea of having a redundant system, but am I going to find that its more of a pain and not cary it? I have done some reading and think if I decide to get one it will be a 19cf, but if you think you have a better idea...I'd love to hear it. Help me spend my money or talk me out of it.