Well, I'm going day hiking with a buddy tomorrow. We're headed to Upper Lena lake in the Olympic Mountains. It's about 7 miles in, with a nearly 4,000 foot elevation gain. My buddy didn't want to try the Putvin trail to Lake of the Angels (wuss).
I'm taking: Leki trekking poles, camera, MSR Waterworks purifier, empty Nalgene bottle, Full Platypus bladder, clean socks, small first aid/survival kit, a couple knives (big and little, 1ea), MRE, Black Diamond LED headlamp, SF Aviator, 550 cord, Garmin eTrex Vista CX GPS, topo map, Red Ledge rain jacket, fleece vest, chemlight, set of thermals, Motrin, trash bag, Zippo, firestarters, SAM Splint, sunglasses, toilet paper, binoculars, carabiner, spare batteries for everything, my hat, and some trailmix/power bars.
It sounds like quite a bit, but all up I think it's under 10 lbs. It gets cold and dark fast up there, and I really don't feel like spending the night accidentally and being unprepared at the same time.