Is the M 7 still in production? Out of production cameras are not much of an issue especially if mechanical or a recent design. Lots of reasonable replacements out there. I fit a light weight RF645 3 lens kit in a divided Eddie Bauer nylon lunch bag; 5x8x9 inches. I have room for 3 or 4 rolls, hoods, filters and batteries.
The 65mm RF645 normal lens is the 80mm equivalent to the M7. I take the 55mm RF optic as my 2nd travel lens. The M7 has one wider optic.
The RF645 lens spread in 35mm terms is 28 - 40 - 63mm (close focus). It's limited like all MF rangefinders. But the 100mm long normal is more usable than the M7 150mm. For general photography the RF645 lens spread is all you need.
The RF 645 has a hand feel closer to Leica by using mostly metal except for the rear film cover and some control parts. It has a sophisticated auto light shield when changing lenses. The M6, M7 and Bronica RF645 are all great cameras.