The duo is set up with a belt loop cut into the back piece of leather.
It sits close and tight on the belt, the cartridges snug against my side.
Wearing it is similarly comfortable and unobtrusive as a 1911 single stack mag in an open top pouch.

Aleko's saddle man made the pockets for the rounds to fit well and to be easy to get the rounds out.

Could it work out on a wrist strap?
Hm.
Really hadn't thought of that myself, but with a wide watch band, I think for this I'd go for one of the leather velcro ones from the Timex watch band display at the local hardware store, it'd work out just fine.

The work I've done with my Tolley on shooting-and-rechambering a pair of rounds has been done with two in my left hand.
The gun's a Jones underlever gun, after the second shot I get the heel of my left hand on the lever to open the gun while the thumb of my right hand peels the hammers back to full cock, let the brass fall, slip the two from my left hand in the chambers and close the gun on the way back to my shoulder. There the gun's loaded and ready to send another pair if I choose.
I can see how the two-on-the right wrist would be handy if a third pair were needed so quick.
For what I'd put this rifle against here on the west coast, anything that would persist (save for a gang of feral tusker hogs) after four shots (or still be there after four misses) would be gone into the woods and out of sight by the time the third pair were handy. Mind you the Tolley is a BPE gun and the brass *most nearly* resembles 450no2NE. I'm not pointing this thing at charging rhino, but come to think of it, if I take that job in Hawaii I may end up getting to go after some of those transplanted feral charging bulls out there...

But yes, I think the DUO would work out quite well on the wrist.

--Tinker