Takes forever to fill the bag with that little opening....then you gotta squeeze the bag to filter in the main bladder. Much faster to just open the a platypus big zip and fill it instantly toss it back in my pack and filter as I drink.
LOL, that's right, if you don't have anything to dip the water and pour it in the squeeze bag you're pretty much SOL. I just use my plastic mug, so it's never been a problem. Any filter that can do double-duty to filter in the field and also rig up with a gravity-fed rig in camp works for me.
Personally I've always been a little leery of putting a zip-up bag in my pack. I might have to check one out though.
