A protein shaker that leaks is as frustrating as a bulb that doesn’t light. I read similar reviews before buying and thought it might have been a one-off product issue. Unfortunately, it turns out to be a design flaw—the O-ring on the main cap widens after just 8-10 uses, causing the leak. The bottle is essentially useless because it leaks. Not happy with the product at all and would NOT recommend it.
