GRAV® Coffee Mug Pocket Bubbler - Assorted ColorsRise and grindsome weed. Your morning routine is about to get a lot more chill with the GRAV Coffee Mug Pocket Bubbler. This mini bubbler is about half the size of our full sized Coffee Mug Bubbler, for an espresso shot worth of morning goodness. The two hole percolator downstem cools smoke in shallow water. And a 45 mouthpiece prevents nasty splashback. At the tip, the mouthpiece hole is angled slightly down, so you can tip the piece away from