If there was no threat of rain I could easily do without the headlamp and a stove here in the Northeast. They'd be replaced by a fire. But that's just for numbers sake, as a small LED is less than a 1/4 oz. I also have strayed away from the tarp poncho concept as my wife took a nasty fall when we were off trail on a nasty piece of terrain going along a creek in Vermont. The poncho obscures the ground at your feet and she stepped on a loose rock and took a header. We use rain jacket/pants, as they work well for wind and cold, as pillow stuffers, and a spare layer.
We've done very sparse equipment hikes when I've hauled in my raft or float tube to fish wilderness ponds in the Adirondacks and Greens. Since we stick with our UL tent w/poles, I could dispense with my trekking poles, but my wife absolutely wouldn't. We've planned on doing at least one stoveless/fireless, cold food only trip this year- the morning coffee is going to be the killer for me. eek
My list has to include a water filter.
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Charlie