I have a habit of collecting things that are unwanted in hopes of making them into something wanted. Some people may call these "unwanted items" trash, junk, or garbage; but I call them objects of potential and possiblities. Empty shampoo bottles and other misc plastic bottles have been one of my current "possibility" projects. And yes, you can see even my cat Tiggy opened one eye to catch the exciting transformation of a shampoo bottle turning into a cat. :-)
When I come to the point of throwing away an empty container or some type of object destined to be tossed away; I think, "What can I make this into? How can I use this item for any of my projects?" Sometimes a "garbage" item makes a useful aid/tool for working on my projects and others play a vital role in the object itself. This is an important role for my cat sculpture. Without the empty bottle, where would my cat sculpture be? It wouldn't be, is the point.