I am still very new to backpacking but I went with the Sawyer Squeeze for water filtering. I had read a number of reviews that noted that the filter was awesome but the bags left much to be desired.
I used the Sawyer bags on one trip and quickly realized a) why folks seem to love the filter and b) why folks seem to not love the bags. I was able to get water but, unless there was a water fall or pipe, it wasn't easy (it was easy to get water into the bags if I could get the bag under running water). I only used them on the one trip, so I can't speak to their longevity but can confirm that it was a pain getting water into them.
I've since bought one of the CNOC 2L bags and plan to use that for a trip coming up in August. The Sawyer bags are small and lightweight, so I'll keep those with me (two is one, one is none) but I plan to use the CNOC bag as my primary means of getting water.
one or more gifts or other benefits from the co-op.