The paper bags would be welcomed at a brockenhaus (second hand charity store)...the silver bags I'd send back to the coop...
Migros charge a 5chf deposit on the silver bags, so of course it makes sense to send them back...
de-sticker them before you send them back (ours have our name on them)...
Doesn`t COOP charge for the freezer bags just as Migros does? I still have a Migros freezer bag sitting here from years ago when I once ordered. Thes said I would get a credit on the next order when I returned it. Despite all the emails they send me, I have yet to order again. I have also never used the bags again as I have much better insulated bags from Costco that I use for shopping. The Migros freezer bag is quite rigid.
As for the paper bags, when they start to fall apart I use them for the papers I shred and then take to recycling.