Climbed Pajarito again today after work. This time, I threw in a big 1 gallon glass jug of apple juice, a big blanket, and my down jacket into the pack in addition to what was there already, for a total of 14.3 kg (31.5 pounds). Of course there is all of the snow that fell yesterday, which was about 7" deep up at the ski lodge. And for some reason one of my poles wouldn't lock down, so I had one 120cm pole and one that was about 50cm.
The added weight makes such a difference. I was really huffing it on the upper half of the route. My time to the top was 63 minutes and 15 seconds, for a rate of 381.0 m/hr. I think this pack weight is probably similar to what I'll actually be hauling up Izta and Orizaba.

