Midwest Pop, CollegeBoxes does a good job with summer storage in my experience. It's all handled online. You register on the website, and they deliver the number of boxes you need about a week before the day you select to have them come get your stuff. For big things that don't fit easily in boxes, they tag them and keep them with your boxes. I think it's more cost-effective to store most things on campus than shipping them back and forth. Then when you get back to campus in the fall, they bring all your stuff to wherever you're living then on a pre-determined date.