Well said, Lori. I take what I need - cold, wet, hungry, or uncomfortable sleep are not acceptable techniques for lightening your load.

The definition of luxury and necessity can change over time. 20 years ago, a chair kit was a luxury, for the trailhead night before the hike started. Nowadays, it's a necessity - resting my back while sitting in camp lets me sleep better which means I function better on the trail the next day. It's well worth the 6 ounces I carry.