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Eric went through several and this is the same one he likes. But it is smallish. Not enough room for all the stuff the op posted.
Eric said it is 7x4x2 and exactly fits a spare mask. He also said to tell you it is a bit of a pita to get things in and out but overall pleased with it.Any chance you can post dimensions for the Hollis pouch? The sites that do list them are all different.
I have the DGX bag that is 7 x 10 and it is too big and flops around.