i carry a wii charger at every game,
I can fill my Kwa ptp like 10 times with it.
But It can only fill my marushin SSb like 3 or 4 times..
It works good only problem i'v ever had was with the seals in it.
Customs decided to tear mine down.. compleatly.. and just threw it in a ziplock bag for the rest of the shipping.
So i had to replace the o-rings in it, because they F'd them up bad.
It was worth it for me, alot better then carrying around a full propane can, or green gas can