I have been trying to cut down on the amount of plastic I waster for about the last year and a half.  I pretty much always have re-usable bags in my truck for groceries, I pretty much always have my travel mug with me for coffee stops, and i pretty much do not use those stupid little one use plastic bags that you buy vegetables in.  I wanted to take that to the net level on my travels to Ecuador this year as it has bugged me for a while how many plastic cups you burn through on an average flight. So I took this tin cup that I had been gifted as a tip earlier in the year and gave it a shot.  'Apparently' (unable to fact check this but sounds plausible) in the USA alone flights burn through one million cups every 6 hours, with an average cross country flight using 350 cups.  Check out the video (it also documents a run and super negative experience I had with Air Canada but more about that another time) and let me know, could you start using a reusable on a plane? and will you?