I'd say most items I carry serve multiple functions:
- My Anyoo rain poncho can also be tied out as a tarp, laid as a ground cloth under my tent, or used to provide a clean area to lay meat bags on while field dressing. I bought mine in multicam before they stopped making that color and thus can also be used as a makeshift blind in a pinch.
- My trekking pole has a 1/4-20 threaded bolt epoxied into the top of it. This makes it a good trekking pole, a monopod/rifle rest (I hike with a V-yoke mounted) or as a monopod for my binos if I take that off. At night it's one of the two poles used to pitch my trekking-pole tent (although when I can, I prefer a ridgeline between two trees).
- My phone is a phone, GPS tracker, satellite communicator when paired with my InReach, camera, ballistics calculator, Kindle, notepad, etc.
- My Gerber Dime (lately I've been carrying the Armbar Mini instead) is a bottle opener, tweezers, scissors, mini screwdriver set, and backup blade (I cut paracord and open boxes with it to keep from dulling my main blade).
- I carry a 4' length of dyneema cord with a titanium Dutchware hook spliced into each end. I use it for hanging my pack, meat bags, gravity-water-filter, wet things that need to dry, and so on from trees or branches.
- My dry bag carries my down quilt during the day and flips inside out with a felt layer on one side at night - stuffed with clothes it makes a passable pillow.
About the only truly single-purpose things are my medical kit and rifle.
