This is a totally bizarre question but it does have relevance to baking.
Does anyone else know what I mean by "tupperware odor"? I don't know how best to describe it other than to say it is kind of a "plasticy" odor.
Come to learn that Tupperware, and also Rubbermaid I think, food storage containers are made of low-density polyethylene, or LDPE a.k.a. plastic #4.
I was moving my sourdough starter into a tupperware-like container which I believe is made of LDPE. A few hours later I checked the starter to see if it still smelled yeasty. It had gone uncharacteristically soupy, as if a lot of proteolysis had taken place. It didn't smell that yeasty but "tupperware odor", or LDPE odor, was unmistakably present. It got me to wondering if there was some kind of chemical reaction going on which put the kybosh on my starter. Stranger things have happened. I had been keeping my starter in a plastic picnic cup not made of LDPE with no "tupperware odor" and had no trouble whatsoever. Over the summer I was having fits trying to get a starter going and what kind of container do you think I was using? LDPE! My successful starters have been made in plastic picnic cups.
I am going on vacation next month and want to bring my starter with me. Yes, I know it's strange but I think I would rather do that than leave it in the fridge. I stir my starter once per day so I will be able to do that. I want some kind of unbreakable or hard-to-break sealable container with a fairly wide mouth. Do they still make peanut butter jars out of glass? That's one possibility. Peanut butter jars used to be made of kind of a heavy glass. Something ceramic would also do. I don't think a mason jar would be break resistant enough. Glass mayonnaise jars tended to be tapered toward the mouth, not good for stirring.
I will be driving so I don't have to worry about being beaten senseless by a TSA thug who thinks a fermented mixture of flour and water could bring down a jetliner.