I wouldn't really want to climb the West side of Pants Pass. That would be a hard task.
A note on it's East side though. The chute you took down is indeed Pants Pass but there is a way you can cheat and take an easier route. When on top you walk along the ridge moving South for about 100 yards to another notch where easy slopes lead you down.
Over all sounds like a great trip. I like how you did not filter. My filter broke on me on day 30 of my trip and I did not filter again for 81 days with no problems.
