Fasten one end to Molle webbing, and it's perfect.

Purchased for the Pintler Pack, since I'm used to having hipbelt pockets. I went with Size S, which was plenty big enough for a small rangefinder or a couple trail bars, spare shells, etc.

Only complaint is that even mounted as far forward as possible, it's still a bit too far back on my hips. Especially since it needs one hand to hold the base of the zipper tight to close it (that is, needs two hands to close). Tip: I tied the Mystery Ranch tag to the molle webbing, and it now closes easily with one hand.

I'd buy a second, but I wish they made a Left/Right version with zippers running different directions. As is, the zipper closes to the front if it's on your left, to the back if it's on your right.