Migros makes a big deal out of sustainability, naturalness and what else do I know.
Migros sells gas cartridges for camping stoves.
The day before yesterday I wanted to hand in the empty cartridge at the customer service / Rothausstrasse / Muttenz /MM, because you should be able to hand it in where you buy it.
They don't accept this, there is no way to dispose of them.
In other Migros yes, but not with them.

It's bad that you can no longer dispose of larger plastic waste because this option has been taken away.
But at least you can now hand in parcels, which are then handed over to the post office.

So cartridges don't work, but parcels for shipping ....super