ferris209 said:

vote_for_palpatine said:

You're welcome, xhonzi:

Oh yeah!! I didn't know what you were talking about at first, but I do now. I miss those things myself, they were awesome for do-it-yourselfers like me, these things could all sorts of Macgyver type stuff. Especially the one's with no holes on the bottom. Anyhow, great pick!!

I think teh purpose of those caps was so the bpttle could stand up - it had to have a rounded end because the pressure from the fizzy liquid inside would warp a regular bottle. Or something. Nowadays we have bottles with the moulded peaks on the bottom - still rounded, but lots of little rounded bits. Moulding tech must have improved I guess.