>>>> big snip Yuri: In all honesty, probably not. If I recall, those are PET (Mylar) and rather lossy. michael,yri,all I have thought of using the same type of "bottles" for a Leyden jar........ and you are correct most are a type of PET called PETG.(polyethylene terephthalate-glycol modified) has a "blue" hue to it,and can be easily sterilized (ie re-fillable) similar properties robert >>> <tesla-at-pupman-dot-com> 07/27/99 09:05AM >>>