To be honest, they're all cheap plastic bottles, but ours is a GOOD cheap plastic bottle. When we decided to create our own pop tops, we dedicated ourselves to making some improvements to this industry-standard packaging solution. For starters, we've manufactured these bottles with a softer BPA-free resin that results in a durable, less brittle bottle with stronger hinges. The softer resin makes opening the bottles easier on your hands but does not affect the odor-reducing seal. We've also made these bottles easier to label.