Firstly it fits very well and stays in place. The adjustable node bridge is a very useful feature. However, the pocket that holds the filter in place may require some work. I've found that the filter tends to work out of the bag as you take the mask off and on multiple times. I think a simple little velcro or attachment point would solve this problem and it could be added without too much trouble. But I think that's an obvious design flaw that should have been exposed.
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