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I actually don't own an M Frame, but this is very useful for carrying multiple bagged pairs and for cleaning. Basically a cleaning mitt. 
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i like to stick 4 pairs of normal glasses individually bagged into mine!
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yups a large roomy bag to just toss your glasses into. great esp for m frames(mag & folding), cuz there's no need to squeeze the frames & lens into that tiny little bag anymore 
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The best bag around.  Sure, it works best for Pro M and Racing Jackets ... but it is still nice sometimes to throw a pair of x-metals in the bag and have plenty of room!