title_body: Are growlers considered open containers?
upvoted_answer: Here is what the PA Liquor Control Board has to say:
  PA LCB answer to legality of selling growlers
  
  In a nutshell, a growler is an open container, but it is up to the local police or state police to decide whether or not to enforce the law. My guess is that if the growler is full and out of your easy reach, you are probably OK unless you have given the cop some reason to hassle you. As I read the law, you are 100% legal if the growler is in the trunk of the car.
  
  If the growler is empty and clean (at least rinsed out), I think they would have a hard time pressing a case. If there is any beer or residue in it, then keep it in the trunk.