I began carrying a multitool back in my search and rescue (SAR) days. I spent nearly 14 years on a volunteer SAR team searching for missing aircraft and missing hikers. I quickly saw the value of carrying a multitool with me at all times as the utility of having pliers, a standard screwdriver, a Phillips screwdriver, an eyeglass screwdriver, a bit driver, scissors, wire cutters, and even a fingernail file was incredibly convenient.
When I got into photography, the multitool came along for the ride, saving me many times. I've used my multitool to tighten loose tripod plates, remove a broken filter, cut repair patches for a hole in a puffy jacket, pull cactus needles out of my boots (and my skin), repair my tripod, and so much more.
My favorite multitool is the Charge Plus TTi by Leatherman. This multitool is made with premium materials, including titanium handles for strength and an ultra-sharp S30V steel knife blade. One of my favorite features is the large bit driver that can accept a wide range of bits, including hex head sizes commonly found on tripod plates and other tripod components.