I use the 2L pop bottle, but have it sitting in an ice cream pail for added capacity just in case. My skimmer runs fairly dry so it takes a very looong time to fill up, weeks probably.
Only time I ever overflowed the pop bottle was when I mispositioned the air stones too close to the skimmer outlet pipe and it caused a partial blockage. Couldn't figure out why the cup was overflowing with the ball valve I use to control the water column height all the way open. The pump I use is normally not able to overflow the skimmer with the valve fully open. Thought to myself, how does a pump get more powerful when it gets older?? Then I noticed a slight knocking noise and realized it was the airstones getting sucked against the outlet causing a restriction resulting in the water column rising too high, doh.
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