Bottle of iodine or merthiolate (or tincture of green soap - they all work well.)
Small dropper bottle of chlorine bleach (for purifying water - about two drops to the quart, shake well, and let it work for about 15 minutes.)
"tourniquet." You can really use just about anything - I keep a couple of issue BDU belts (with the "tri-glide" buckle) around for heavy pressure bandages or tourniquets. Easier to handle than rope, and easier to release (if you have to use a tourniquet, you need to release it once every 10-15 minutes for about 30 seconds to keep the tissue alive. A tourniquet is usually considered a 'drastic' measure, and should only be actually removed by a surgeon.)
CA glue (cyanoacrylate ester) works well for minor cuts and scrapes - that's what it was actually invented for. As I recall, there ain't a germ that can handle the stuff - and it sticks through blood. Check yourself for an allergy by putting a small drop on the inside skin of your elbow and watch it for 48-72 hours. Watch for a reaction - if you have one, do not put it in your kit! (Slight redness can be considered normal, but any rashes, inflammation, or turning bright red is a "reaction.") Check your regular companions as well. It's no replacement for a bandage or pressure on deep cuts, but it works well for all the little cuts you tend to get on your hands.
Ditto on the maxis - they're great for bloodstoppers.
If you plan to carry a well-stocked kit, make sure you know how to use it! Take a course in First Aid (you can take it by itself or with a basic CPR course.) If you want to expand past that, take the next course up - there are a series of First Aid courses (not very many - I think it goes First Aid, Basic Life Support, Advanced Life Support, First Responder.) There are also variations on the CPR course (Basic, Infant/Child, Elderly. I don't think they teach "two-rescuer" CPR anymore.)
Check around - both Gall's and various industrial supply outfits (that cater to construction workers) should have sunscreen in the form of the little wet towels like you get at KFC - much easier to handle in the field. Some alcohol prep pads are also useful - you can use them directly to disinfect minor cuts, and I've used them as a first layer (under the gauze) on heavier cuts to keep them sterile.
Water. You'll need it - it can help to replace blood volume in some cases (keeping the fluids up.) Carry some salt as well - if you spend time in the desert and get dried out, drinking just plain water won't help you as much as water with a little salt will.
A "burn gel" pad won't go awry - sooner or later, someone is going to get themselves burned somehow. Might as well be ready.
Keep it all in a rigid case! My kit is housed in a Swedish military vehicle first aid kit box - it's not only rigid (and really tough!) it's also compartmented for organisation. Two luggage latches, and it flops open. There it is!
Keep a couple of road flares around for starting fires. Shock makes you cold - you'll need to keep their heat up. Also, they can be used for signalling, or for starting signal fires (if you're really up the creek...)
And again, having the gear isn't a guarantee that you'll handle emergencies. It's a heavy part mindset, and a heavy part training (equipment can be improvised, if you know what you're about.) Take a course or three! If you're taught well and you pay attention, you'll need less gear to handle an emergency, and you won't panic (panicking often gets people killed. Remember that...)
Granola bars. If you are stranded somwhere your going to get hungry and if its freezing out, the water and animals wont be easy to find.
