Interesting reading the zillion amazon reviews. Carry around nasty water and sip it clean through the filter.
Since you don't have a pump you'll need something to scoop the water if you can't submerge your holding container. No biggie, just something to consider. Major drawback seems to be sterilization. The one guy talks about using his steripen but doesn't seem to cover dirty water.
Tempting but I'll stick with my cleanable 15oz MSR miniworks. Seems to be one my best buys as the years roll by pumping out tasty water.