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Title: So easy, why isn't everyone using this?
Review: These are so easy. I don't have to wash a million bottles anymore! I just have to wash the nipples. The only complaint I have is that I pre-fill with water and dump in the formula when I'm ready, but when I put in the 8 oz. and let the bottle sit for a while, the bag expands a little so it only looks like I have 7 oz. So the measurements may be a little off. I would use a measuring cup to make sure you get exactly how much water you want and not rely on the liner's measurements.
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