While they excel as hip accessories, cocktail shakers often fail when it comes to function. Not so with this new FlipTop shaker from Metrokane. It has just two pieces, a double-wall stainless body and a black screw-on lid. With a finger push, you can open or close the top, and the built-in strainer means truly one-handed operation. Plus, it’s dishwasher safe. The shaker is $30 at Winestuff.com.