Other than firearms.......

[Seawolf1090]

I have three Spanish CETME bayonets - one for each of my rifles (CETME and FR8) and a spare. The bolo blade is a nice all-around camping knife, once properly sharpened.
My repro Finn M39 bayonet is a good camping knife too - the Finns designed it for 'multi-tasking'.
I got a Vietnam-era B44 Rocket Pack (Warsaw Pact issue) that makes a dandy tent carrier. Got several GI canteens and two stainless canteen cups - I camp in a somewhat minimalist way, and I cook my food in the GI cup.
The East German plastic canteens are great too - they don't impart the plastic taste to water like the GI canteens. I keep a couple in the tank panniers of my motorcycle - I ride the back roads and forest roads a lot and I like to keep water available.
GI blankets, for camping and home use - Having spent ten years in the military, I grew to like them. No wool allergies.
I have a good collection of various small pouches, magazine pouches, etc. I have two different Swiss surplus rifle cleaning kits. My shooting bag contains a US GI AR-15 cleaning kit with extra tips included.
Of course, my Bug Out pack is the tried&true Alice Pack. Got four of them, and have one set up on a comfortable civilian frame set.
I am always looking for GI surplus stuff to add to the stockpile.