Today I exchanged my empty Soda Stream cartridge for an M Classic. Unfortunately, these are only available at the customer service desk in the store in question and I was shopping with Subito and still had various Cumulus coupons that I wanted to redeem with my other purchases. I was told that this was not possible with Subito because of the deposit. I had to pay for the bottle separately at the customer service desk, I'm not going to spend the 2x Cumulus voucher for 12 Fr! What a shame. Dear Migros, it would be nice if you would adapt your system. Thank you