I couldn't find one with glass bottles, had to take whatever they had, some kind of plastic. For that reason, I only use them when I am ready to do full recipe. Don't like to let the CO2 sit in there extracting the plastic. Paid 15$ extra for two more empty bottles that might come in handy with warmer temps. or when a return of energy turns me wild in creativity... lol Seriously, my herb garden will serve the purpose.