This is an excerpt from a response I gave to another person regarding the Sawyer water filtering system and my experience with it. I thought I would add it to other threads regarding water/filtration. Hope this is helpful.
I have a Sawyer Point One Squeeze System that I purchased on Amazon last spring. It consists of the cartridge filter and three bags (32, 16, and 12 ounces). My wife and I made our first visit to IR last September. We each had an empty 32 oz Gatorade bottle that we used to carry and drink filtered water.
We did the Feldtmann Lake loop from Windigo. I thought the Sawyer system worked extremely well, and I plan to stick with this in the future. The system itself weighs about 3 ounces, I can't see how you can get much lighter than this. You just want to be careful in filling your bottle to not drip unfiltered water into the filtered water. The only problem I encountered was a little water tended to leak out of the cartridge when in my pack (there is a plastic cap that you can replace on the spout tip, but the end that screws on the bags still remains open and can leak). I plan to solve this by carrying the filter in a mini ziplock bag. We carried unfiltered water in the Sawyer bags with the caps that come with the bags, and filtered what we needed as we went. We also had some Mio (concentrated flavoring liquid) with us, which was really nice.
I did have a Sea to Summit camp sink, which I used to carry all the filtering equipment and water bags inside my pack. I also used it to get water initially, before transferring it into the bags (to fill the bags, I used a small plastic glass that my wife brought from the hotel we stayed at before coming over on the Voyageur II). This cracked and subsequently needed a duct tape fix.
For our next trip, I am leaving the S-t-S sink at home, replacing it with 2 or 3 two gallon ziplock bags, which will save a lot of weight. I plan to snip the corner off a smaller ziplock bag to use as a funnel in transferring water from the big ziplocks to the Sawyer bags. I do know that a few people have had problems with the Sawyer bags leaking. I found that they will flow water through the filter by gravity alone. I did squeeze them, but did so rather gently. It does not take much pressure to filter a reasonable amount of water pretty quickly. Personally, I think the system rocks and I plan to stick with this for some time to come.
Happy trails!
ETB