Belts are viewed as more of a necessity, simply because your lower back is crucial to everything else you do. There are a lot of people who believe that by wearing a belt, you are limiting your lower back development, and that is true to some extent. But just like with straps, if your lower back is out of shape and you are a bodybuilder, you will want to offer it some additional training exercises with back extensions or lighter deadlifts to make sure the area gets the attention it needs. You are only as strong as your weakest link. Do not leave your belt in the bag because you think it makes you less of a lifter, though. It can be the tool that helps you train safer and for longer than guys who choose not to wear one.