+1 on Dwight Schuh

To the emergency supplies add a small mirror, water purifying tablets, space blanket, tweezers, compass, whistle, moleskin, chapstick, and a good waterproof map. Together those weigh very little.

For fire starter, try some cottom balls soaked in vaseline. Carry them in a small bottle like a prescription bottle.

If you wear glasses, take a spare pair inside a light, hard case. Break a temple, lose a screw or break a lens and you'll be glad you did.

Merino wool is best for your first couple of layers because among other great qualities, it still insulates when wet.