I like the Grayl water filters. I've used mine for international travel as well as on two 1+ week tours on GDMBR. One of my touring partners on GDMBR had a Sawyer system and started borrowing my Grayl at water stops after seeing how easy it was to use. It also served as an extra water bottle. Most complaints seem to relate to the fact it does take some force but I don't find that to be a problem and I'm no he-man. I'm still on my first filter but now see that maybe it is due for replacement because of age. The ultra compact is on clearance at REI. I might buy another. It was recommended to me in Cambodia by an Australian who used his while trekking in Nepal.