New York Magazine - The Best Cocktail Shakers, According to Bartenders

It’s critically important, then, to find a well-designed shaker that you feel comfortable using. If a shaker is too heavy, doesn’t seal right, or is too hard to open, it can be a huge impediment to the quality of your drinks, so it’s important to keep those factors into consideration when choosing a set for yourself. The best shakers are made entirely from metal, usually stainless steel. Shaking sets that rely on a pint glass are too heavy and do not seal well and are therefore not recommended. Furthermore, high-quality shaking sets are usually weighted, giving them a bit more balance and maneuverability.