In the Air Force when I was on the ground outside the wire in our forward deployed locations, we had an IFAK, or Individual First Aid Kit, or in Army Jargon, Improved First Aid Kit. The Air Force one that I had was a bit more extensive, but the Army one that I have from my duty gear, was what made the base for my tractor first air kit.
Below is a list of the contents and a photo of and IFAK. The idea is that you want to be able to stop bleeding, until help arrives, and help maintain an airway. Stopping bleeding will save your life. Wound suturing, and cleaning should really be performed in a sterile environment using aseptic techniques, because an infection can and will kill you.
I bought a kit that mounts to my ROPS and that I hopefully can reach if I need it. You unzip it, and it folds down, so everything is in front of you so you can access it with one hand. I added a few items to mine, like band-aids, and a few other items that I may need if the wound is small, and does not require me to leave where I am at, but the most important issue is to be able to 1) get help, and 2) stabilize yourself, or someone else until help arrives. I often use my tractor to cut and split firewood in the woods on our property, and I want to be able to save myself if I have an accident beyond all of my safety gear (Chaps, Helmet, Eyes, and Ears, cut resistant gloves, and steel toe boots.)
I keep a very loud whistle on the keychain of my tractor and on my belt so I can call for help if I need it. A whistle will be heard a lot farther than yelling. I have a small air horn in my bag incase I can't use a-b, and also to scare away a bear if need be. I usually always maintain two way radio contact with my wife with small FRS radios and she knows where I am at, and what I am doing. This may all sound like overkill, but my life is a very important priority to me, and I have seen what can happen.
These are items that no kit should be without in my opinion, and what we had standard in our kits in the military. In the kit is a tourniquet, and this will save your life if the wound is severe enough, but as a disclaimer, this is to be used only as a last resort, because you will loose your limb below this device:
Amazon.com: C-A-T Combat Application Tourniquet All black version: Health & Personal Care I also have Quick Clot, and this is a great resource to have if you need to stop bleeding, and you can buy it for very inexpensive:
Amazon.com: Quikclot Sport Brand Advanced Clotting Sponge ,Stop Bleeding Fast, 50 Gram Package: Health & Personal Care
There are also several Israeli Bandages that will work as a pressure bandage, and allow you to keep the bandage in place with the straps attached to it. They run under $9
Amazon.com: Ever Ready First Aid Israeli Bandage Battle Dressing First Aid Compression Bandage, 6 Inch, 5 Ounce: Health & Personal Care
Below are photos of my kit, and where I bought it. You can find IFAK's pre made on eBay, and other sites for around $50 with all you need to save your life. I also have an epi-pen because I am allergic to bees, and I have run over a large underground nest on my tractor before in the woods. Hope this helps, and stay safe!
A Pre-made Kit:
Elite First Aid Inc Enhanced IFAK Level 1 1st Aid Kit FA200 ACU Black Tan OD | eBay
My ROPS First Aid bag: (you can click on each photo to open it)
Smittybilt 769541 First Aid Storage Bag : Amazon.com : Automotive
My Set Up:
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The US Army IFAK kit contents:
Tourniquet, Combat Application
Bandage Kit, Elastic
Bandage Gauze 4-1/2" 100/Pkg
Adhesive Tape Surg 2" 6's Roll
Airway, Nasopharyngeal, 28fr, 12s
Glove, Patient Exam 100/Pkg (4ea)
Pouch, IFAK
Insert, IFAK (has folding panels, with cord attached)