I have one that I take with me to the woods and also when I travel. Because of a post on another forum, I even brought it with me this morning. It's one that I put together myself and it's been mostly the same for the last 40 years with only a couple of changes. Originally I used a zippered pouch for everything but after that wore out I switched to a plastic Rubbermaid kitchen box that's about the size of a sandwich, 5.5x4.75x2.25 inches. It weighs 8.75 ounces, if the little postage scale I used is to be believed.
There's more in there than first aid stuff, however, mainly because with my previous arrangement, which was a pouch with two separate compartments, I kept little odds and ends on one side, the 1st aid stuff on the other side. I'm not sure if a box or soft pouch is better. The non-first aid stuff includes scissors, "space blanket," some nylon repair tape and matches. There's supposed to be tweezers there but they seem to have gone missing. But my new Swiss Army Knife "Sentinel" has tweezers. The Sentinel is just about perfect for a pocket knife, by the way.
The first aid stuff includes about a dozen assorted Band-aids (sticking plasters), some larger pads, a piece of moleskin, two Ibuprofen tablets and a little metal Bayer aspirin box with mixture of a aspirin and something stronger that I don't remember the name of. The box holds 12 tablets but there's only ten there right now. In 40 years, I've only used tablets out of that box and nothing else, ever. There's one more item there, too.
Given that I've only used headache pills out of everything that's there, I've wondered about the value of what I have. Small bandaids are probably unnecessary and probably so is the space blanket. So I started thinking what I needed a first aid kit for in the first place. The only injuries I've suffered over their years since I was little have been falls and a few rather bad cuts from saws and, uh, being in fights. Band-aids would have been useless. So I included some time back an army field dressing, which in this case is a US Army "Dressing, First Aid, Field." It seems like a reasonable thing to do but I haven't deleted anything else. Mostly I just sort of selected some things just so the box would be full.
I used to include a roll of white medical tape but it wouldn't fit in the box and I'm not sure where it is at the moment but I still have a couple of rolls. One thing that's missing and which I've never had is antiseptic cream of any kind. I also carry along according to the season, sunblock, insect repellant and hand balm (I use Badger healing balm all winter long) and sometimes lip balm. But I don't count that as first aid stuff.
I'm sure I'm not including something that's essential but even at home, I don't seem to ever use any medication stronger than aspirin and I'm not sure the aspirin does any good and I have my doubts about insect repellant.