In the which the rabidrunner documents the suprisingly necessary running accoutrements.
The Garmin Forerunner 305.
To ensure the distance. Or better yet - to ensure you don't exceed the necessary distance. Measures pace, distance, altitude, heart rate. Fun to sleep with too. See what your resting heart rate is when you wake up! Doesn't vibrate though...
Hydrate or die dude. The pouch is good for storing toilet paper, snacks and double-caffeinated excedrine.
Fuel. With Caffeine... aaahh!
Great for keeping track of mileage on shoes. One dot equals 8 miles (approximately). Shoes are toast after 45 - 50 dots. Huffing it gives a decent kick when out of caffeine.