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It's not only the clumsy that can be hurt by glass carboys. I've used glass carboys exclusively for over 15 years, for both primary and secondary fermentation. I brew about 20 batches per year. That's 300 batches X 2 = 600 times I've handled, sanitized, and rinsed a carboy. I have always been careful and never had an issue until last weekend. While lifting the carboy to pour a small amount of rinse water into the sink (one hand on the neck and one hand under the bottom, just like always), the bottom fell out of the carboy without warning. There was nothing I could do to prevent the broken glass from doing significant damage to my hand. I have 2 other carboys which I'll continue to use, but I'll be switching to plastic for primary. Now I just need to decide between plastic bucket and plastic carboy.