I was thinking of this canteen as I carry a canteen anyway in my edc backpack. The big reason I like my PUR Hiker is that I can pump water from very small sources. With the use of a rag I can prefilter out the sludge. It filters at .5 microns. I don't know if that'a nominally or absolute.

My preference right now is Potable Aqua. In most cases I don't carry a filter. For the case of drinking mud which is a likely scenario I don't know if either filter would be that helpful.

In any case I carry 130 ounces of water every day.