A good bit of dealing with "clutter" is really about dealing with habit. Yes, sometimes it's a storage problem, but in my observation at home and in other places, it's most often because there is no regular and consistent way of immediately or nearly immediately dealing with things. Like Matt, I work from home (when not traveling) and things like junk mail get sorted out and into the recycling bin as soon as I bring the mail into the house. When I'm away, I often find it in a pile on the kitchen island or on my chair in my office. The difference is that I just deal with it and others don't. It's also quite normal for many of us to just have too much stuff and that's also often accompanied by time lags in disposing of things no longer needed, such as taking them to Goodwill or getting them listed on Craig's List and out the door. (I have that issue right now with a few things and have to deal with them "soon") For things that are truly needed where storage is limited, there has to sometimes be a bit of creativity...
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The most expensive tool is the one you buy "cheaply" and often...