I have just seen that this topic was discussed a long time ago and would now like to take it up again, as I consider it to be very important. So:

I'm pleased that others are also concerned about the plastic problem, so I ask myself the question: why not compostable bags - like the compost bags that are already available in Migros?
Aperto, for example, is currently putting this into practice and I think it's an extremely good idea.
Of course, it would be even better if everyone took their own reusable bag with them, but as this is not always feasible and many people simply forget to do this, I understand that you can't do without in-store bags completely.

I would be interested to know what you think of this and what your general opinion is on the subject :)