Snug as a bug on your pillow all tucked in sleeping after drinking hot tea - Shellback Tactical Triple Stacker Open Top M4 Mag Pouch

No complaints at all. All 6 Gen 2 Pmags fit in it snugly. Not so snug that they are difficult to put in, not so loose that they rattle around. They are fairly easy to get out when needed.
I personally like that the holster material only goes about half way up the magazine, making grabbing it even easier than it normally would be
MOLLE is pretty standard. Fits on my plate carrier nice and tight, no complaints.
Material is sturdy and holds it's shape well, while bending they way it should and having the give in it that it should too