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This is a serviceable and sturdy mask bag. I had to move and re-sew the velcro on the side pocket because it was situated in such a way that you could not close the pocket tight, and anti-fog, etc., would easily fall out. The free anti-fog that came with it is in my save-a-dive kit, and I have not used it.
You will never actually use it. I bought three, but still carry tanks the old-fashioned way, by the top.