Donate what you can't sell. Learning from past moving expereince, I've kept my wardrobe to a minimum, with only a few quality items. If you haven't been as successful keeping your clothing collection to a minimum, then it's time to donate. All those sweaters and jeans that you've outgrown, the shirts and pants that have been buried for years, they can all be donated for a good cause.
Store what you can't/won't sell. Some pieces of furniture or items have more than a monetary value to you. Maybe that amoire in your bedroom has been in the family for generations. For these truly meaningful treasured belongings, you can rent a store your items in a local storage facility. Before you store anything, make sure that the facility is secure, practices proper maintenance, and offers environmental conditions ideal for your property. The last thing you want is have mold growing on your family heirloom. Moving is not the most fun thing to do, by keeping your possessions in check even when you're not anticipating a move is always a good practice. You won't only be prepared when it comes time to move, you'll be saving money and creating less waste as well! (Images: TheMuuj; Box Town: lovelihood; Storage Hallway: lovelihood ; all licensed for use under Creative Commons )