Let's see; treestand fannypack features......
1. A holster of some kind to hold a tree mounted screw in type bowholder in case the bowholder on my stand doesn't work due to a treebranchor so that I can use this screw in hook to hang items like antlers, binocs, etc. instead of taking up room in a pouch and putting holes in my pouch.
2. A rangefinder/ small binoc compartment.
3. grunt tube/can call pocket
4. Large pocket for full face cold weatherheadgear, extra gloves.
5. small pocket for disposeable handwarmers so that this is never opened until needed as the packaging makes noise. A small compass and some waterproof matches could go in here too. Candy bar with noisy wrappercould go in here too.
6. pocket for knife, writing pen for deer tag date of kill, tag, and license

From what I hear and read, it is tough to beat a badlands pack. Here is their fanny pack, has 7 compartments I believe. Guys rave about the badland pack. It might be cheaper and a better product by just getting theirs and having Jeff sew predator over it.
http://www.badlandspacks.com/packs.php