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If you haven't already, I'd highly recommend taking a Tactical Combat Casualty Care (TCCC or TC3) class, or at least a basic first aid class that the local Red Cross or someone might be offering. Medical equipment can be a complete mystery until you see how someone with a lot of experience, like a combat medic, has used it in real world situations. As an example, the medics that taught my last Army Combat Lifesaver Course (a five day class) had ditched a lot of "fancy" gear and taught how to close and dress a lot of wounds using gauze, Ace wrap bandages, and 4" wide medical tape. They found that it was much faster in a combat situation to use the same common items rather than digging around for specific types of bandages or dressings. They also showed us how the various brands of chest seals had trouble sticking to sweating and bloody wounds and needed reinforcement to stay in place - like Ace wraps and 4" tape. I don't consider myself in any way to be a first aid expert, but I've had enough training that I've been able to deal with some relatively minor wounds (fortunately in non-combat situations) and feel like I have a basic understanding of how to handle more serious ones if I should encounter them.

Anyway, with that out of the way, I'd recommend starting with the component list for a quality individual first aid kit, like the military Individual First Aid Kit (IFAK) or the Blue Force Gear Trauma Kit Now. Build on it from there with other items as you learn how to use them, such as an Israeli bandage.

The BFG advanced Micro Trauma Kit Now supplies include items that definitely require training, such as the chest decompression needle. Don't even consider something like that if you haven't been trained how to use it (no offense, I have no idea what your level of medical training is). I carry a Micro Trauma Kit Now on the back of my belt, although I bought it empty and then filled it with a combination of supplies I already had and some additional ones I purchased, following their content list and packing it as their video shows.

For tourniquets, I prefer the Tactical Medical Solutions SOFTT-W Tourniquet 1.5 GEN 4. The metal windlass helps ensure that the tourniquet provides enough pressure when used on large and/or muscular limbs. The buckle on this latest version is also really handy, because you can clip it around the limb instead of having to slide the loop all the way up it.

Combat gauze is great stuff for packing wounds to stop (or at least slow) bleeding. It's not cheap, but it's good to use directly on the wound, and then cover it with standard gauze or an Ace wrap to hold it in place. As a side story, I helped treat a couple people after a car accident on I-95 about four years ago, and an off-duty paramedic who I gave a pack of combat gauze to didn't really understand how it works. She said it was her first time using it, and she wrapped it around the injured leg just like regular gauze, rather than packing the combat gauze into the wound to focus its clotting effects.

Stay safe, and get some training on this stuff before carrying it.

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Maybe he has a pistol/rifle that fits in a discreet quick access backpack, but he doesn’t want to dig out mags from it..