StJ - You're welcome <img src="/ubbthreads/images/graemlins/smile.gif" alt="" /> . As you develop your GHB please feel free to ask questions.
SH - Thanks <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> . It sounds like you have a good start on your kit.
1) You might consider looking at a AquaMira Frontier filter, because they take up about the same amount of space as two bic lights and a pencil. This particular model is a "suck through" only type filter, but is good for 20 gallons, and can be found online for as little as $11 DELIVERED <img src="/ubbthreads/images/graemlins/ooo.gif" alt="" /> . If you had a little more space, I would very much recommend the AquaMira Frontier Pro, because it can be used as a gravity filter.
2) Be sure to add a Bic butane lighter or if space is at a premium a "Bic Mini".
3) The smallest Light-My-Fire brand "ferro rod" takes up very little space, and produces sparks for fire making even when its too cold for butane or too windy for matches.
4) A bottle of Portable Aqua tablets take up little space, and can save your life. They do taste bad though.
5) If you add a couple of large "Contractor Bags" you'll be able to fashion a very very crude poncho or rudimentary shelter.
6) Wal-Mart sells flimsy disposable ponchos for $1. They take up little space, and actually keep you somewhat dry.
7) If you can find one of the very flat Emergency Space blankets I'd add one! Wal-Mart's is too "poofy" to fit in a small pouch.
8) I would really recommend you add some 550 Para Cord (25 feet minimum) to your PSK. There are just too many uses.
9) Lastly, if you take a business card and roll duct-tape (or gorilla tape) length wise over it you'll end up with a very flat and small "multi-purpose survival item".
Regarding pouches....there are several great options available that could potentially hold your survival gear and/or FAK supplies:
A) Tactical Tailor Zippered Medical Pouch. This is the "Premium" option. I have one, and its extremely well made. However, this is not designed for belt carry - it has Tactical Tailor's proprietary "Malice Clips" on the back for attachment to a MOLLE ruck or vest. They can be used as belt loops, but its not an optimal solution.
http://www.tacticaltailor.com/medicpouch.aspxB) A good budgetary option is Blackhawk's E&E Pouch. You'd be surprised how much you can stuff in one of these!
http://www.blackhawk.com/product/Escape-and-Evasion-Drop-Pouch,840,1452.htm
C) Two more "not so inexpensive" options are the Tactical Tailor "Cross Fire" which also have a CCW compartment, and Maxpedition "Octa" waistpack. The Octa will hold a lot less than you expect though (from looking at the pictures).
http://www.tacticaltailor.com/crossfireconcealedcarrybag.aspxhttp://www.maxpedition.com/store/pc/OCTA-VERSIPACK-4p433.htmI own all of the above options, and fully recommend them. I do not, however, own the following item. However, from my extensive experience with Tactical Tailor products I feel comfortable recommending it:
D) This might fit more to your particular needs as the "holster" component is just a velcro loop that can be pulled out easily allowing you to use the rest of the space.
http://www.tacticaltailor.com/lunarconcealedcarrypouch.aspxThere are a host of other options, but I tend to only recommend products I have direct experience of ownership (and use of). Option "D" is an exception, but due to having owned well over $2000 worth of Tactical Tailor gear I'm comfortable with offering it as a solution.
Tom - I hope you don't view the above as "deal spotting". I linked to the manufacturer's websites for reference only. <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />