Also, if you're having to filter super dirty water, you'd probably want to use a handkerchief to pre-filter the water, but that slows things down as well.
hollohas: I've used the squeeze bag to fill a few containers (2 bags per full canteen) for soup and coffee and stuff. The way you roll the bag to squeeze the water through the filter is great. But it would for sure not be as smooth having to do the same through a water bottle, and even less fun through a soda bottle.