"sometimes you're not operating out of a base camp, but still want to bag a peak (or two) on route to camp- a small, light pack can be pretty handy vs dumping all of you non-needed gear- if it can serve multiple use better yet"
Exactly. I did get the Sea to Summit pack Franco recommended and when I got to the base of the peak I was going to climb last Saturday, I hung my pack and my dog's pack, to keep the marmots from getting them, and then summitted with the small pack with just water, gels, and emergency gear. There was no trail and it was a steep ascent. It was so much easier just carrying the small pack. I supposed I could have just hung the pack liner and the dog pack and used my backpack, but for a couple of oz, I like this method a lot more.