Fromage:
I think they weed out some pussies on the way to Muir by making them haul huge packs. I was the only person in the group who wore leather boots. They will make exceptions, but, you'd better have a good reason. I argued my feet were super wide and none of their rentals would fit me. It was interesting that there were people in my group who were from Arizona in plastic boots, Super dooper down parkas and full on goretex bibs who were "freezin!" in 30 degree temps. I was like "whatever, we're on Mt. Rainier, duuhh".
Chris - I'll make you a package deal for an Eddie Bauer Down Parka, Eddie Bauer Goretex parka, Kelty 0 degree mummy bag and a Lowe Alpine Crossbow 90 backpack. All lightly used and in excellent condition. Send me a PM or email if you're interested.