Storing yogurt and cream etc

I bought a set similar to the ones linked by SueDonim. Mine are round and square, various sizes, they stretch to fit almost any container. They came in a handy zip lock bag. I use them all the time .

You can get silicon seals, like this. Most supermarkets sell them. www.amazon.co.uk/Silicone-Stretch-Freezer-Microwave-Reusable/dp/B0C4F36W3H/ref=sr_1_16?crid=3CDZU9QF3L79U&keywords=silicone%2Bcovers&sprefix=silicon%2Bcovers%2Caps%2C81&th=1&tag=gransnetforum-21&qid=1688338806&sr=8-16

Otherwise I just pop the open container inside a Tupperware pot and put a lid on that.

I got a reusable lid from yeo Valley - for the (roughly) pint sized pots.
The big ones that are about 900g still have a lid.

I sense that many of these changes are merely jumping on the band wagon in the name of environmental friendliness.
Many are impractical and inferior.

Yes I think it’s daft and they get tipped over so easily. Some sort of universal lid like there used to be available for pet food cans only transparent maybe an answer but are all cartons the same dimensions though.