Not in pack, but a tripod shooting stick. I use the Shockey trigger sticks.
Shoot off of it, lay binos on to glass, use as trekking pole, stomp rattlesnake you're about to step on, sling rifle over when taking a break, check water depth, poke buddy when you want to get his attention, the list is long.
Won't leave home without them.
Mesh facemask. and liner gloves. I pretty much always wear both while I'm out there. Helps with protecting you from the sun. Rx for a pain med. Learned that lesson the hard way before.
NEBO MYCRO Headlamps! They're super small but give ya 2hrs at max brightness (something like 150lumens) or 4-5 hours at 50 lumens. I bring some Nauzene tablets in my med kit now. Sometimes when pushing it, especially with a pain med... I can get cramps forming in upper abdominal muscles. Those tabs have electrolytes and so forth. And don't require water to consume them.