One of the riders on the tour I was on last summer had one of those. It took a long time for the water to filter through with fine ground coffee. I have a polycarbonate french press/travel mug that would work if ground coffee was the only thing available (and if I remembered to pack it). Since I have a cup holder on the handlebar of my LHT, I can stick a travel mug in it. Once empty of coffee or tea, the mug can serve as a water carrier as well.