For day hikes (into fairly remote areas), I carry a moderately larger day pack with enough gear to -- if somewhat uncomfortably -- get by for a week (in summer)

For day hikes (into fairly remote areas), I carry a moderately larger day pack with enough gear to -- if somewhat uncomfortably -- get by for a week (in summer). Enough clothing (layers) to overnight and/or be comfortable on a cool day. Rain gear. Multipurpose tool. Local map(s). Adequate water for the day, plus water purification. Compass. First aid kit. Light source (these days, LED). Fire-making equipment. High cal trail mix. Bug repellent. Sunscreen. For convenience and comfort, some TP. The pack's still quite manageable -- I need the exercise, anyway. And in addition to taking care of myself, I'm ready to help anyone on the trail who might be in trouble but unprepared. Until it was recently stolen, I had a Jansport daypack that I rather liked. As mentioned, moderately larger (than a standard "backpack"). And while without a rigid frame, it did have a waist belt, although I often didn't use it. P.S. I forgot to mention the cell phone. Turned off to conserve battery. In some areas, I have reception. In others, I know/suspect that after a few days missing, someone will bring in a local tranceiver to look for a signal from me. (And family know where I am and what network my phone uses.) P.P.S. Signal mirror -- many compass models include a mirror that can function as such. I wrote this whole comment ad hoc, without actually packing or consulting a list. And a mylar "thermo-blanket". Also quite shiny and "visible" -- and I think some now come colored red on one side.