No bubble to burst here. But HPA is for air....and there are plenty of players and entire teams that use Nitro all the time for paintball, with good reason. Yes CO2 is put in as a liquid...which wouldnt be practical for the avy bag use. I was simply stating that N is way more efficient and reliable at colder temps. (Mark stated "air is 70% N so that point is moot") so I have to agree with Buff in that its not moot. If you fill a tank with N and another tank with Air, at room temperature, and then take it into a cold environment the N will be more reliable and efficient than the air.