this post was submitted on 20 Feb 2025
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The issue you're highlighting is due to the difference between metal and plastic. I have an Orca bottle that has a plastic lid that screws on without any rubber gasket and I end up with shreds of plastic in the bottle.
Plastic rubbing on metal leads to the plastic degrading and metal on metal does not make a good seal, so I think a rubber gasket is your only option.
Perhaps a design where both mating surfaces are plastic with metal for the rest of the body? A lot of vacuum insulated bottles have plastic bonded to metal in the cap, they just have to repeat that with the bottle itself