321 Storage is conveniently located at 379 S. Longhollow Rd. Maryville TN 37801. The facility, which has been around for a number of years now, is located in a secure location while still being easy to find. The convenient location allows us to serve many of the neighboring towns. We have an attractive storage facility with great features such as full fenced, a variety of unit sizes, and state of the art security. Also, you can rent a boat, RV & self storage unit from us online hassle-free and have the convenience of Easy Pay.