I haven't shipped anything out of Geneva, but my experience shipping things to Geneva (from Canada) is that until you have enough to actually fill a container, air freight (commercial airlines offer this service) is a lot cheaper and faster than surface shipping (truck/boat/etc). However, there is usually a minumum charge which would probably be a few hundred chf, so for one suitcase, yes, that would be very expensive. If that's all you have it is cheaper to pay for an excess bag on your flight. Or use DHL or something like that.

also, this:

http://www.glocals.com/forums/general/Sending-Large-Parcel-Abroad-225570.htm

Thank you Rowan , much appreciated!