I also have two Elite Tactical Systems (ETS) Carbon Smoke GEN 2 AR-15 mags with Couplers. These are only $16.50, and the clear ones are $21.00. I'd rather have clear mags than smoke, but didn't want to spend $9 more to get a better look at my ammo. The same mags without built-in couplers are $16.50 and $19.00. The smoke nags are the same price but clear ones with couplers are $2 more than clear ones without. They make mag followers for $15.99 with a Tritium dot on the back so you can keep track of your ammo level at night, ang they sell mags with it already in them. They also sell Black, OD Green, and FDE Nylon mags for $12.75 apiece, $2.20 less than a PMAG.
So, here they are from all 4 sides. And in front of the ATI Schmeisser mag, and side by side with it. There's no way these will fit in my mag pouches when their coupled together. And when they're uncoupled, they take up most of the width of a 3 mag pouch, and don't slide in and out very easily. They're okay to carry in a range bag, or to carry in the gun and drop on the ground when they're empty, but not so great for carrying in mag pouches like my ALICE gear.
https://www.etsgroup.us/ETS-Group-AR15-Magazines-s/1814.htm