ORIGINAL: budjet
but some prices SILLY i mean 130 quid plus for a kevlar tank for a boomer,well if you MUST have it then buy it but whats wrong with a 5quid 2litre bottle from RS.
Simple answer.... The Kevlar tank is molded to fit the airframe perfectly maximizing your fuel load and placing it on the CG. Bit difficult to do with a with a pop bottle on most airframes