Brad, just curious, what would be your recommended pack for me to use for frequent 2-4 day trips, 50lbs worth on avg in the pack, and the occassional 100+ trip, and convenient to use? I'll try anything, but I must admit that I've been pretty happy with the MR NICE bags I've used since 2004, which are always improving. I also really like the Solo that Kurt loaned me to try.. ultra lightweight and very slick. I've yet to load down either of the packs that I've been using this summer with more than 50lbs though. MR has made some tweaks to the prototype I've been using this summer, and aside from being a little on the heavy side, it should be a terrific pack for what I like to use them for..