Ah, forgot to mention that I recently purchased a Sawyer Squeeze, which only adds a few ounces. My light is either a headlamp which I wrap around my hat or a small energizer hard case mini-light on a belt loop which I wear. Either way, the light doesn't get equated into the pack weight.

good questions though!

I have heard that the tarp is a frivolous thing to bring - I guess I thought it would be valuable in a survival situation but hard to justify the 19oz for an "odds against" what-if...