Having a cramped up sched is never an excuse to not eat healthy. Your diet plays a very important role when it comes to both the way you feel and the way you look. That is why the very idea of salad in a jar is most likely the best thing since sliced bread, sliced whole wheat bread, anyway.
However to keep the crunch when you munch, you must follow the salad sequence. There is much more to salad in a jar than just merely stuffing in all the goodness however you please. Check out this video and learn all about the step by step, ingredient by ingredient, way to pack your salad perfectly.
When you are done packing up your salad in a jar, make sure you seal it tight the night before, pop it in the ref, and it will be ready for you to just grab and go the next day. As long as you keep the jar at an upright position, you can rest assured that your greens will be nice and crunchy.