Brian,

Another bummer of the REI featherweight mirror is that it is not really flat and cannot reflect the light as good as the Ritter PSP mirror. The Ritter PSP mirror could save your butt. I’d put the REI mirror in your wallet and put a Ritter PSP mirror in your PSK. If you swap the DMT hone for the credit card size you should be at the same volume you are now.
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Thermo-regulate, hydrate and communicate.