A Nalgene water bottle or two filled with very hot water makes a great sleeping bag warmer. So do a couple of those air-activated hand warmers: one at the feet and one up at the neck.
I carry a couple of large sanitary napkins for dealing with a heavy-bleeding wound.
IÂ’ve used the VBL (vapor barrier liner) concept in my boots a few times during some cold, snowy adventures, but I do it a bit different. I put my foot in a plastic bag, and then put my wool socks over them so that the perspiration from my feet donÂ’t wet my socks. My feet stay warm, but not dry. By keeping the insulation dry (socks), my feet stay warmer even though they look like prunes when I get home. Now this assumes a water-proof boot. If the boots are subject to leaking, then another bag on the outside of the socks would be in order.
I keep a very small (~2”) lock-back folding knife and an LED key chain pinch light tied together with a small piece of cord in my pocket so that I always have a blade and light with me. Countless times it has been used to find my headlamp in my pack or tent when darkness has fallen while I’ve been exploring around camp or visiting another camp.
A Nalgene water bottle on the dashboard facing south can be used to make “sun tea”.
A small piece of closed-cell foam makes a good sit-pad for cold, damp, or rough surfaces. It also protects the seat of one’s pants from abrasion, and can be useful as part of one’s Emergency Kit for slowing conduction losses during un-planned time in the bush. Add a few air-activated hand warmers and one of those “pocket-sized” reflective blankets and it’s not a bad start for un-planned bivouacs.
A small collection of plastic bags can be useful. I keep one 55 gallon, two 13 gallon, and about six 1 gallon bags with me for: left-over pre-packaged food, trash, pack covers, ground cloths, emergency poncho, sitting on damp or muddy ground, table cloth, separating dirty or wet clothing from clean and dry, making ice packs, protecting books, maps, & electronic gear from water, emergency “gloves”, collecting many quarts of water at one time from a stream that is some distance away so that I can wash dishes, bath, or filter it at camp, and I use them for storing the small game I collect while hunting.
In the vehicle I keep a package of disposable washcloths that are marketed for bed-ridden folks and sold in pharmacies. They are thick and large, so I only need two to get a “complete” bath. Whether I’m returning from a backpacking adventure or car-camping, they’re used for a sponge bath to refresh and lessen the odor impact I might have on other folks when heading for a store, restaurant, or other public place on the way home.