The tragedy with the recent two young hunters in Colorado should reinforce the credo, be prepared. I've had to spend two unexpected nights out (once as a warden, once hunting), both sucked badly, but not badly enough I was harmed.
My day hunting pack is not overly light and gets less light as the season progresses and it gets colder. I might be carrying it to a little on the extreme end, but again spending an unexpected night out sucks. I always have adequate rain gear, always adequate insulating layers (adjusted by season/weather), I carry a small tarp/stakes and have an insulated pad (spend a lot of time on the pad glassing, but definitely handy for an emergency). My fire kit is robust and redundant. I also carry a very light sleeping bag that is synthetic and can be worn "poncho" style—it's only rated to 50 degrees and have no plans to crawl in it and have a relaxing night out. What I would do is layer over all of my other clothing for just one more insulating layer; which I have found to be very handy when glassing in very cold conditions.
My inReach (and a small portable charger) in addition to my cell phone which now has satellite capability (albeit not as good as the inReach) are nonnegotiable—they go with me always and even w/o an emergency have been super handy. Letting my wife know I'm going to be late, splitting up w/ a buddy and having the ability to communicate, getting stuck in your vehicle w/o cell phone coverage and occasionally a message to my buddies to come help me pack an elk out
Everyone's hunting is going to be different, different weather, different topography, how far back in, etc, but regardless give some thought about what if I have to spend a night out or have an emergency.
Be safe this Fall!
My day hunting pack is not overly light and gets less light as the season progresses and it gets colder. I might be carrying it to a little on the extreme end, but again spending an unexpected night out sucks. I always have adequate rain gear, always adequate insulating layers (adjusted by season/weather), I carry a small tarp/stakes and have an insulated pad (spend a lot of time on the pad glassing, but definitely handy for an emergency). My fire kit is robust and redundant. I also carry a very light sleeping bag that is synthetic and can be worn "poncho" style—it's only rated to 50 degrees and have no plans to crawl in it and have a relaxing night out. What I would do is layer over all of my other clothing for just one more insulating layer; which I have found to be very handy when glassing in very cold conditions.
My inReach (and a small portable charger) in addition to my cell phone which now has satellite capability (albeit not as good as the inReach) are nonnegotiable—they go with me always and even w/o an emergency have been super handy. Letting my wife know I'm going to be late, splitting up w/ a buddy and having the ability to communicate, getting stuck in your vehicle w/o cell phone coverage and occasionally a message to my buddies to come help me pack an elk out

Everyone's hunting is going to be different, different weather, different topography, how far back in, etc, but regardless give some thought about what if I have to spend a night out or have an emergency.
Be safe this Fall!