We just got back from 2 weeks in the Netherlands and I used this for my back pack and for my suitcase all in one. Sherpani Cabo (13 L) travel pack from REI. I was able to carry on long train rides, trams, airplanes and put under the seat in planes. You would be surprised how much you can put in it and it is light weight. I bought a backpack rain cover from Amazon which I did need some days.
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