Now that BBB is no longer recommending many brands of plastic bottles, the choices are down to the other plastic, plastic drop-ins, and glass. We've opted for glass, but realize glass is prone to breaking. I wonder if there is some way to suggest to the manufacturers to use tempered glass. Is that not cost effective? I just read an article that parents were scrambling for glass bottles, but they were all sold out. So it sounds like there would be a market for this "classic" product. I've already broken one bottle (eek!), and in the future wouldn't mind spending a bit more for a much stronger material.