I've understood for some time that "ultralight" meant "under five pounds base". Not sure where I got that idea, but, like Glen, I have gone lighter by simply being caught without my pack. It was a worrisome incident, it was a bit chill, but I had a lighter and small knife in my pocket, a canteen and cup on my belt, and I was in an area with lots of down wood, and time enough to get ready. I was hungry, a bit sleepless, and not completely comfortable, but I was certainly ok when my friends came and got me in the morning. If I had had the compass on my wrist (that I always have now) I think I could have walked out instead of bivouaccing. And then there was the night of the Order of the Arrow initiation. Best, jcp