The RAT-7 has a "generic" sharpening stone in the patch.. i'm sure it would work in a pinch but not for repeated or prolonged usage.
I'll look into that one you suggested.

More Items to Add:

-Salt & Sugar Packets (3/each)
-Tea/Coffee Bags (3)
-Work Gloves (MechaniX) [i'll have snow gloves if in winter]
-Mosquito Net

Ok, so as pictured I did a quick estimate of $800 worth of items over $50 not counting any misc. items.
I would put the value at anywhere from 1000 to 1300 coutning all the smal items and items I plan to add.

You can of course save a bunch by not going with the Chris Reeve knife, scaling down the flashlight, getting rid of the miox, etc.