It was primarily designed as a pistol magazine pouch, which I got to model with one of the Glock style iCombat CO2 training magazines the SUP mk II can carry a range of items including pistol magazines, multitools or knives, flashlights of up to 1” diameter bezel, flexicuffs and even OC spray if that's your thing.
The pouch has a hook-and-loop removable lid can be adjusted to securely fit items varying in length. There is an internal hard plastic plating within the flap, for one handed operation during the reload or access to your needfuls. Internal elastic retention on the sides allows the SUP mk II to act as a shingle for CQB application. Might not be as tacticool as a TACO pouch but they fully work. I have my second-hand Gerber multitool in one of mine, which lives in the small of my back on one of my rigger belts, everywhere I go.
These low profile pouches are great for storage of quick access items and are small enough to be placed anywhere on your rig without hindrance to your freedom of movement.
The pouch is fitted with PALS/MOLLE attachment system, with a single channel of two rows, one after another (no gape) so you can loop it a couple of ways. Instead of a press-stud closure it has a fiddly hook-field sewn into the bottom webbing loop, and the stiff plastic reinforced tongue has a corresponding field-loop, and a tab of webbing to use as a draw pull. I found this really difficult to set up right, as it was on the opposite side of the tab than I would have expected. This means that to fasten it it has to be doubled over, which made me pretty nervous about how well it attaches.
It's never come loose, even when I have had it rigged for a belt loop, rather than fed through other PALS/MOLLE but I'm just hesitant.
The drainage grommet in the bottom of the pouch nicely frames the needle-nose Gerber pliers, and seats them nicely, and having a good pouch for my multitool has been a crucial part of my EDC.