Eiwitshakerdeksel

The built-in agitator on this lid actually works—my greens powder mixes completely smooth with zero lumps for the first time. It clicks on tight and doesn't leak in my gym bag, which is a huge relief after past shaker disasters.

The flip and sip lid seals tight enough for my bag, but the agitator still leaves tiny clumps if I don't shake it hard enough. It works okay for a quick mix, though I wish it broke down the powder more evenly.