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I'll try to answer a bit more directly, although Kill is right, it's probably been answered a blue-billion times somewhere within this forum.

A lot depends on how you play, but the way I figure, you should get a large enough tank to shoot all the paintballs you would normally carry into a game. e.g. I carry 200 in the hooper and 4x160 round tubes... 200+(4x160)=840 rnd. On my A5 with 20oz CO2, expansion chamber, remote, and an egrip in full auto (12bps), I go through about 1300-1500 paintballs per fill on a warm day. ymmv

Sux to run out of air and still have paintballs to shoot!

I started with a 20oz and bottle on the grip. It can be heavy on a full tank. Plus I shot a lot of liquid when playing that way because I would end up tilting the marker forward and allowing liquid to run up into the marker. Now I run the 20oz by remote and on a warm day can shoot full auto without freezing the marker.

Hope that helps. I'm sure there are some really good pros/cons to be found searching thru the forum.

My 2¢

MG

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A-5, eGrip, 14" TruFlight QB, 12" PPS Black non-ported w/APEX tip, P90 Mod, X7 hopper, Barska 50mm Red Dot, Laser Sight, CMI remote w/ProConnect, CMI Regulator R-2000, SCI 88/4500, Dye LLP, Proto Switch EL, DIY ratchet mod, polished internals
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If you're planning to run it on the gun, a 20oz tank will be heavy. Personally I run a 20oz with a remote so that I don't have to worry about the weight and I still have a tank that's large enough to get me through the day. A remote will also act kinda like an expansion chamber, in that it will let some of the gas expand before it gets to the marker. Additionally, if you're using a belt pack to carry the bottle, then the chances are it'll be vertical, so the gas comes from the top of the bottle, not from the liquid at the bottom. All this means less chance of getting liquid CO2 in your gun (unless you're shooting like there's no tomorrow), and less chance of frozen internals.

There are many more topics on the forum explaining the pros and cons of running different tanks in different locations. Just do lots of reading and decide what best suits your style.

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The best bet would to just buy a 20 ounce and put it on remote... With a 20oz you dont have to worry about running out as much and its also worth it because they are like 5 bucks more

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