Clearly label the tops and sides of all boxes so you know their contents. Also, on all boxes containing fragile items and seal with packing tape . Do not place boxes directly on concrete floors, use pallets, skids, or plastic to prevent moisture absorption and prevent condensation. Keep items away from the walls and raised off the floor with pallets will allow air to circulate within the unit and cut down on humidity. Store items you'll need most often at the front of the unit. When packing your storage unit, create a center aisle for access to all items. Pack heavy items such as books and tools in small boxes. Mattresses should be covered and stored flat on level surfaces. Tape or tie bed rails together. Mark pieces for easier assembly later. Pad mirrors and paintings with paper and cardboard. If you're storing tables and other furniture, remove legs and store tabletops and sofas on end, to save space. Old photographs tend to curl over time. To keep the