list your pony bottle size options / reasons

[Shooter]

             I agree with the Dog on this one, but on deeper dives like on Isle Royale, or most overhead enviorments, usually like to wear doubles. I carry a 30cf pony, have a decent breathing rate, and have found it sufficient, small enough to not be in the way too much, still easy enough to hand off. Would'nt ever invest in a "spare air" WAAAAY too little in volume for anyone in ANY emergency at 100' leaving nothing for the depth (above 30') requiring the slowest assent. (Seriously first breath at 100', second at 60' YIKES!!!! for someone who might be on the verge of panic) Cylinder cost on this group of pony's is typically the same, so would recommend a pony on the larger end of the scale.
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I also use doubles when diving deep or on a planned decompression dive. It's really nice not having to worry about running out of air. I carry a 30 ft.³ stage bottle. When I am ice diving locally, I use a single steel 120 and carry my stage bottle. The stage bottle does get in my way when I'm loading my speargun. :-\

I can print my own nitrox stickers  ;D  . I usually just jump in and go  > I monitor my computer of course. When I am doing a planned decompression dive I plan out my entire dive and even have 2 backup plans. It's nice having it written out on your wrist, and not having to do complicated math problems under water while experiencing narcosis. Most of the time it's jump in and go. Why dive air when you can dive voodoo gas! Mamma says voodoo gas is the devil! My sac rate always changes depending on the size of the fish I see,current, or how narced I am at the time.  Here is a simple calculator for those of you who would like to figure out your sac rate.