There is no denying the excellence of the Mason jar. The ubiquitous glass container is the kitchen equivalent of galvanized gas pipe in that it’s good for way more than it was originally intended. Yeah, you can use it to preserve fruit. But it’s also good for storing screws and nails on the workbench, planting flowers and, oh yeah, drinking. The Mason Jar Cocktail Shaker takes everyone’s favorite glass vessel and turns it into the favorite bar accessory of cocktail aficionados the world over. It’s just like that steel cocktail shaker you have right now (it’s probably branded by a vodka manufacturer and came as a gift pack with the last bottle you bought), except it looks better.