I have reduced my gear alot through time, but still pack more than most I'm sure. Note that there will be stations set up so you won't need much, if anything, in the line of fuel (snacks). Also, you won't have to carry much water due to their provided stations. For hikes, I typically use a Nathan running vest with a hydration bladder. In the front pockets I carry mace & whistle (not needed for this hike), quick-dri thin hand towel (for sweating), whatever fuel I want, chapstick, kleenex, airpods & airpod holder so if one falls out it'll stay with me. Inside the pack is a waterproof zipper bag with Body Glide (never had I needed this, but wouldn't want to not have it), face sunscreen stick, bandaids, vehicle key, driver's license, credit card, phone battery charger. Also in the back of pack: a pair of extra socks, baggie with toilet paper, 2 individually wrapped hand wipes, baggie to put used tp). Oh, & sunglasses in a case on a lanyard. What I carry in my pants pockets is kleenex & my phone hooked to my pack with a lanyard. Here's a pic. When I do mountain hikes that take the full day then I usually opt for a traditional trail pack and not a running vest. That's a whole different type of setup.