Great list! On top of that I would recommend seeking training; having the equipment doesn’t always mean effective use of it. The standard EMT courses are always great but they rely too much on an ambulance worth of gear enroute to a level 1+ facility. Two courses that come to mind which represent more of the conditions we would have to perform austere first aid in are Wilderness First Aid and the more lengthy, Wilderness First Responder.
Good list! Two things I would recommend. I would add Granite Gear to the mid-tier for packs. They make high quality, durable gear that also doesn’t scream TACTICAL if that is important to you. I would also move London Bridge Trading to the premium tier; they make equal (if not better gear) than Tactical Tailor.