I love making altoids-type kits and this is a good one for sure. This XL size tin gives you a LOT of space to use! You might consider looking for a smaller whistle that doesn't take up as much room in the tin. I know you have some things covered but being prepared also means having multiple solutions to a problem: several ways to start a fire, (matches, lighter and a fero-rod are already in the kit.) boil water etc. Two is one and one is none.
I would suggest:
-some form of fire starter aid such as a tiny zip lock bag full of dryer lint, or some paper towels rolled up and dipped in paraffin and then sliced into tiny disks about 1/2" thick. They don't take up much space but burn like the dickens if needed. You could also use a few cotton balls smeared with petroleum jelly and stashed in one of those tiny zip lock bags ( the kind that small parts such as machine screws come in) The piece of straw has some cotton ball/petroleum jelly sealed in it, I also have a chunk of fatwood.
- a piece of heavy foil that is folded up to fit in the bottom of the tin would have several uses- making a cup, use it to cook fish or small game. It would take up almost no space at all.
-waterproof/windproof matches Yup, in the small match box.
-wire survival type saw Great idea,
-instead of the small nylon string, you could replace it with 200 FEET of spyder- wire type fishing braid in the 20-30 lb range that can be used for cordage to build a shelter or fishing line, it takes up almost no space in the kit and can do many things. The nail pictured has quite a bit of 8lb test fishing line on it, I also wrap the tin when closed with about 40 feet of paracord.
- safety pins
- various fish hooks with a few lead sinkers (maybe a few choice fishing flies that work well in your area- where I live in NC a black wolly bugger will catch fish anywhere) I have some hooks and jig heads taped to the bottom of the tin (on the inside)
- water purification tabs
- a few Tylenol caplets
- 2 Imodium tablets
- 2 benadryl tablets
I ended up making two separate altoids kits, one is geared towards first aid and includes band aids, Tylenol, a couple tea bags and stuff geared towards replenishing/repairing the body. The second kit that is in a pouch on my BK2 is geared towards shelter and fire and is pretty similar to the one above.