PerfectShaker crafts the world's best 100 percent leak-free shaker bottles and mixing bottles. Mix protein, greens, waffle batter, sauces, gravy or anything really. BPA-free and dishwasher safe. Perfect shakers feature a stay-open flip cap with an extra wide mouth and a screw on lid without a rubber seal that is leak free. Perfect shakers are easy to use and easy to clean and are dishwasher safe. Perfect shakers are lightweight and portable and fit in most drink holders. Now you can mix, pour and store all in the same container.