A great way to organize electrical items,  plumbing items, unused small garden tools, books, and old clothes is to use the boxes that copy paper comes in.  The boxes, that used to hold approximately 10 reams of paper, are made of heavy-duty cardboard, have lids, and can be stacked easily on the floor of the garage, or on shelves.  These boxes sometimes can be picked up from office supply places or your local copy shop. Businesses also dump these on a regular basis, so check with a friendly owner near your home. And aesthetically, they all match.