Have you ever noticed that when you move, you pack away all sorts of things that you promptly forget you have? We have duplicated many a home improvement whatchamacallit because we forgot we ever had one to begin with.
Case in point: painting materials. Last night I went down into the cellar to retrieve a respirator and our 6ML dropcloths so I could create the "air-lock" for the bathroom to protect the rest of the house against lead paint dust. We have more brushes, paint can openers, roller frames, roller covers, roller handles, hats and shoe covers, and other paint paraphernalia than you could ever imagine. It's because we never bothered to look at what we already had....or, we'd get to the store and impulsively decide to paint something without any idea of what we had in the way of supplies, so we'd buy all new. Not so smart! At least we're ready if those walls are ever fully plastered, cured, and ready to paint.
I shudder to think of what else we have several of. At least we stopped with one house!