Storing bike boxes in Zurich

Hello,
My husband and I are flying into and out of Zurich for a bike tour through France and Switzerland in mid June-end of July. We are looking for somewhere to store our bike boxes and possibly a duffel bag for 5 weeks while we are touring. Are there any warmshowers hosts out there that have space for 2 boxes or know of a hotel/hostel that will easily store them?
Thanks!
Vix