In the world of paddlers, mountain bikers, surfers, and other outdoors enthusiasts, "dirtbag" isn't a pejorative; it's a lifestyle choice, one Michael Stratton -- local kayaker, ultrarunner, and MTBer -- lives despite also holding down at least one real job. Stratton straddles worlds, but it's hard to keep a girlfriend when home has no heat and a sleeping bag beckons every night.