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Yeah, you'd get one slightly over-extracted coffee if you do one cup after the other.
I use this for camping, http://www.ultralightoutdoorgear.co.uk/equipment-c3/kitchen-stuff-c8/kitchen-accessories-c18/ultralight-javadrip-p545
and think it would be great for general travellingtwo of these would be make quick easy coffee without needing paper filter, but goes against you're making two in one device brief
any large plastic coffee cone should be fine for travelling http://www.amazon.co.uk/Genuine-Original-Melitta-Filter-Brewing/dp/B00QJ0X6SS/ref=sr_1_11?ie=UTF8&qid=1439881452&sr=8-11&keywords=plastic+coffee+filter