I use the First Spear Admin Pouch on my HRKB. In the long thin pocket, I keep either a Lightning Strike Firestarter or a 10 round .45 ACP mag there, depending on if I am packing my 1911.
In the larger, more square-shaped pocket, I keep my compass, pace count beads, S&S Precision V-lite, and an Emerson EDC-2.
I have a similar set up on my standard Recon Kit Bag in Multicam, except I am using a Blue Force Gear Helium Whisper Admin Pouch, along with an HSGI Pistol Taco.
Hope that helps.