When I travel I usually take three of these 900ml bags: one for a Sawyer filter (the threads match perfectly), one with a hose from a Platypus Hoser -Tank (the threads also fit) and one to change when the pot is empty. It's great that these bottles can stand on their own, which makes it easy to filter the water in them from the top. SmartWater sport caps also fit, allowing you to wash your Sawyer with it in the field. The only thing I can say about this product is that although I've been using the same 2 drinking bottles for 5 years with no problems, I've had to replace the filter bottle once or twice. Eventually, where the hard and soft plastic meet at the top, the glue or plastic will begin to blow out. This is usually slow enough for you, or if you're carrying multiple packs like me, you can just use one of the others to filter. In any case, it was more durable and useful than the bags that come with Sawyer. Also, it would be nice to have more sizes on the side of the bottle (like Nalgene or Platypus Hoser) but that would just be a bonus.
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