Hey Jen, I had 4 of them, and 2 cracked. They cracked right through the glass, but only on one side (so they didnt actually break apart, but you could see that the crack went right through the whole side of the glass) It cracked part way through the first time it was burnt with a votive in it. I havent seen the Christmas mugs yet, might have to check them out!! (I LOVE dollarama! I worked there for 2 years in high school, man they have amazing stuff)