I agree -- good list. The guys who got here first beat me to the map & compass, you already added extra socks (for winter look at all wool eg., Smartwool). Yeah, carry a small bottle of water.

What's is in your First Aid Kit?

A small pry bar would be nice to have if you need to open a door that doesn't want to be opened. I'd also carry a small locking folder in addition to the LM Wave, but I'm a knife knut.