A pillowslip for travellers

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Surfing the web I just found an original idea of an Austrian firm. They are producing a special pillowslip that you can take with you while travelling and then use it on your hotel's pillows. It should prevent you from resting your head on dust, mites etc. This is their site, but it's only in German. http://www.biodomus.at/ What do you think about this? Personally, I think it's a good idea to help allergic people. For myself I prefer to "force" the hotels to provide clean bedware as they are paid to do. It would be uncomfortable to have other things in the luggage...