Story:
I've recently began taking my fixed gear on long rides. That necessitates carrying an axel bolt wrench - 15mm - for the inevitable flats. My current wrench is a heavy Craftsman.

Question:
Are there lightweight options for axel bolt removal?

Thoughts:
1. Maybe an allen bolt adapter? (8mm -> 15mm cup.)
2. Carbon-fiber wrench? (Only half kidding.)
3. Replace the bolts somehow with something that would be accessible with my multi-tool?

Disclaimer:
Don't hate because I'm tring to save weight. I go on 100+ mile rides and a heavy tool in the jersey pocket becomes really annoying after 25,000 pedal revolutions.