It's hard enough to keep your place organized, so why keep all of your out-of-season items around where they're cluttering up your space and life? When the seasons change, put those seasonal items and clothes into low-profile plastic bins and store them under your bed or stacked in your closet (if you have space). This will keep you from sifting through bikinis while looking for sweaters or drowning in winter coats while looking for shorts. It seems like a pain, but once you get into the habit you'll love all the space and organization you have!
