Yeah, CNOC for dirty and EverNew for clean and then the blue adaptor you see. Hang it, set up the Duplex or whatever, gravity does the work and there’s 2 liters clean water.
We tried a BeFree and it was the BEST…. Until it stops working. The Sawyer is field-maintainable but the BeFree really isn’t.
FWIW, the goretex X-Ultra’s are really good shoes. I toggle between those and the regular ones depending on the season; we have very wet winters here and they do a good job of keeping my socks dry on day hikes and around the property in the wet grass and weeds and so on. But for through-hiking type stuff, no way. They’d never dry out. They’d get really stinky.
