I carry a Colt 1911, either a Commander (usually) or a government model (less frequently).
The vast majority of the time, I don't carry an extra magazine.
When I do, I use a Milt Sparks or DelFatti mag pouch: either single or, less frequently, a double. These are all leather, carry on the belt vertically and only cover about 40% of the magazine. Very minimalist and very comfortable.
I can't imagine carrying a contraption like OP displayed in his initial post, nor would I carry a nylon knife case as a substitute for a proper mag carrier.