Organize. With just a little forethought, you would be amazed at what you can fit into a small space.
Cat litter. Or sand. When you live in a place with winter, you will want to carry either of these items with you, as snowmelt and refreeze can cause a slippery pathway to your outdoor unit. Sand and cat litter create enough friction that you won't slip.
Wrap and Insulate. Temperature extremes can damage certain items. Be sure to wrap such items extra carefully to insulate from the cold or to protect against the humidity. If you have an especially valuable item that may be particularly sensitive, consider the climate-controlled units.
Pallets, pallets, pallets. They are really the best item for keeping your belongings off the floor and protecting them from unexpected spills, rain, and snowmelt. An added bonus: they're also easy to find for free, especially at warehouse stores.
Wrap as much as possible. The best way to do this is to use industrial plastic wrap. This will keep moisture, dust, and unwanted critters out of your belongings.
Label, and then label some more. When you are going back through your belongings a year from now, you likely won't remember which box has all of your hangers. Label all of your boxes, and you might be able to avoid a scramble for that "one item" you need.
Make sure to use Lexington Mini-Storage for all of your storage needs!