Are glass bottles as breakable as people make it seem?

We have to purchase the next size up in bottles soon anyway and I want to get glass since we don't even use plastic for ourselves.
Are they /that/ breakable? I don't think bottle companies would sell them if they'd be breaking all the time right??
I'm thinking we'd get the Avent since that's what we have in plastic bottles currently- so any suggestions beyond that would be great too!