I do not build a chest rig, without this multi-purpose pouch. My first chest rigs used the standard weight multi-purpose pouch, but now I use the Fight Light. The durability is outstanding on both. This pouch can be used as a small GP pouch, but I have also used it as a small trauma kit. I don't ever run any kind of admin type pouch, but a good GP, for essential gear as I mention below is very, very useful. The multi-purpose pouch has 3 compartments. A single compartment in the front which has 3 elastic "keepers" you can use to secure things like lighters, folding knife, camo sticks, I even keep an extra ACE bandage in one. The back section of the pouch is also divided, a small notebook, pencil, protractor, a compass, protein bars, small section of a map, my Fortrex 401 when not in use, it is roomier than you think, think the size of an Army issue protractor. It fits without bending the protractor. I also have used this pouch on my Camelbacks, and on some of my other rucks that have PALS webbing. I have also used this as a trauma kit, it will hold a pair trauma shears in the back compartment, with room for Celox, NPA, Moleskin, bandages etc. Seriously, of all the pouches there are to have, this pouch and Tactical Tailor's universal mag pouch are hands down the two most important/useful pouches I've used. You cannot go wrong. You will end up with more than one. Tactical Tailor's customer service is excellent and their sewists are BAR NONE.