Alright I've been looking for the last 3 pages of the pneumatic discussion on this topic but failed to do so. Anyway I've been trying to look for a mini compressor which I can hook up to my power point, but I just realised that these compressors don't really have initial "reservoir" and pump it's self on it's own I think.

There's an example compressor I was planning to buy for about $30. I was thinking if I should buy it and for example will it pump up a 2.25L Air Bottle / 4.5L Air bottle up to at least 90PSI.





