I currently own 2 M1 helmets, but not a bagger. They are the same size as most open face helmets with a flip up face shield. They do fit in my GTL side cases. Incidentally, mine are listed for sale in the classified section on this forum if interested.

 

I have a C3 Large and it fits easily. I don't see why the M1 would not fit.

 

FWIW, I own a Schuberth C4 Helmet and it does not fit in the Bagger side case.

 

So the c3 fits but NOT the c4?
Weird.
The GTL side cases are bigger than the B.

 

Yes, thats strange. I also have a Shoei Neotech II, which has a larger shell, and it fits. Very tight but fits. I thought the C4 had a smaller shell than the Shoei.

 

Thanks for this. Will try it

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Nope, my Aria wont fit upside down either. At least not without forcing it.