Kombucha Makers Unite; Where to ask and be answered in Recipe Sharing Posted July 8, 2015 He who dares and all that ... I do want fizzy kombucha. Will just have to accept possible kombucha bomb as a possibility (or should that be inevitability?). Quality of glass is a big deal here as well. Heavy swing tops like those used by Grolsch are excellent. We once used glass swingtops that were really only designed to hold water to store milk kefir during a Labor Day picnic and the pressure of the active fermentation split the bottles right down the seam as they sat on the table. Not all glass is created equally. Start there. Remember, there's glass out there that's designed with withstand the pressure of champagne and other carbonated beverages.