I'm from Poland and I'd like to try some couchsurfing after the trip in the mountains. I'd have to carry all things on my back, so this should be small and very light. A normally proposed souvenir from Poland is polish vodka Żubrówka, but it's not an option to carry it in the mountains for over the week.
So, what can be taken, that would make the host happy and don't make my back hurt? The most appreciate answers will be those based on your experience and/or expert knowledge of couchsurfing.