Bottles for sparkling wine

[rayh53]

All my bottles come from recycling. Either from our own store bought source or from the recycling station. Aside from a label, how can I identify a bottle suitable for a batch of sparkling wine?

 

[REDBOATNY]

Look for champagne bottles. They are thicker glass and the neck is formed to accept a crown cap. Like a beer bottle.

 

[rayh53]

I have a few that are, by weight, heavy relative to typical bottles. Is there a difference with the tops? I assume there needs to be a neck suitable for the cage.

 

[sour_grapes]

As Redboat says, a key distinguishing feature is the very top of the neck has a lip that is meant for a cap (like a beer bottle). Just below this is a thick ridge or bulge, that the cage can gain purchase against.