It’s a relatively okay shaker if you make it a point to swirl your powder to mix it because it has no seal around the mouth hole, which makes it prone to spilling if you’re not carefully clenching it shut like your life depends on it. Sometimes liquid will also get in the threading of the lid. Otherwise as a vessel (not a shaker) to drink from, it does its job. If you use a straw long enough, you can pour fizzy drinks in and avoid the bubbles getting your keyboard all gross.