Yes, it is also possible to deposit luggage for a month or a year at the SBB Railway Center. There are no restrictions on the size but only on the weight, which must not exceed 25 kg.
However, it is not possible to book the service in advance. Colleagues at the counter will advise you of alternatives if there is really no room.
Here you will find a map of the station, you will have to go to the SBB Railway Center (under the airport level).