The easiest way to prevent your salad from getting soggy is to layer the more delicate ingredients such as greens and lettuce away from the dressing. In fact, that is the main purpose of mason jars! When you use regular containers for salads and try to take them for lunch, you end up with soggy lettuce because all the ingredients are mixed together.   Mason jars are also great for salad and ensuring crisp lettuce because you don't need to pack an extra container for the dressing. As long as the veggies are layered on top and the proteins/dressing are on the bottom, you won't have a problem with soggy salad.