I'm sure everyone has a different list of tools for elk hunting. I bet if you do a search you'll find a lot of info. A few things I always have are a basic survival kit (Firestarter, emergency shelter/space blanket, compass/map, first aid basics, small flashlight, whistle, signal mirror, water, wool sweater).I usually hunt solo so always try and let my wife know the general area I'll be in. I always have a set of good game bags, sharp knife w/ sharpener, parachute cord. Also, I use the gutless method to process elk and pretty much always bone out the meat for the pack out. I lay the meat on the space blanket to keep it clean while I'm butchering. Good rain gear is another thing I don't skimp on since it usually rains. Some mornings I'll wear rain pants or gore-tex gaiters to hunt because you'll get soaked from the dew wet underbrush. A small water filter/purifier can also come in handy if you don't want to pack much water. The area I hunt has lots of small creeks/springs.
In my quiver I usually have 4 broadheads and 2 Judo's for grouse. In the pack I'll have an extra bowstring, a couple extra nocks, and some super-glue. There's lots of other things you can carry, it just depends on how much weight you want to tote. Also, I'm sure I've missed something and others can add to this. Have a great hunt,
Rick