The happy hack you already used pursuant to Wideopeneats. You only go there when you are happy with your gadget.
Tupperware items of 7 plastic conforming to Mommyfootprint. Your purge plastics might notice that the products are coded with resin codes. Because tupperware have a lifetime, they are labeled with codes.
How sure tupperware? conforming to Popsci. Dear earthtalk, read that bottles always contain harmful chemicals. Same tupperware problems.