Jun 21, 2010 - 9:15 AM
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Yes, this is commonly done in Switzerland. As far as I know you will have no problems at all traveling with your packs using public transportation. Many buses have a compartment for luggage that can be reached from the outside by the bus driver, and in trains you can stow your packs most of the times in or near the entrance of the railway car.
Many paragliders use public transportation too, and their packs are rather big.
Switzerland is a safe country to travel, so you don't have to worry about stowing your gear in a place where you can't actually see it.
Have a nice time!