Stopper pops out of carboy

[kombat]

Whenever I empty a carboy, I immediately clean it and sanitize it. I cover the mouth with a sanitized foil "cap" to protect it, so that the next time I need it, it's already sanitized.

Apropos the stopper issue, when it's time to use the carboy, I re-use that foil "cap" by wrapping it around the stopper and neck of the carboy to hold the bung in place if it's slippery.