I once made a habit of saving every useable container that I had. Pretty soon every spare space I had was full of cottage cheese containers, juice bottles, and other types of containers. I thought I might need them some day and it is true, some have come in handy. But that whole business got way out of control. Now I keep only the ones that I know I have a use for. My favorite being wide-mouth plastic jars. There are a lot of uses for those. And I've reclaimed my house in the process.