Simply select the supplements you need for the day, make sure you know the correct dose and put them in the glove compartment, then put the Smartshake XL in your bag and move on with your busy day. It's completely waterproof, so there's no reason to worry about spills. It is also made from BPA free plastic and is freezer, microwave and dishwasher safe, so you can be sure it will stay in good condition even with heavy use.