Replying to Stranded car

We have all come back to the car from a day of riding one time or another to find the battery is dead and that you dont have any jumper cables. Sucks having to go around asking, hey, do you have any cables, if you do, can you give me a jump? Most times you do find someone able and willing to help, sometimes it ends up being an employee of the mountain. What are some good items to pack in your ride when going to the mountain? Of course cables or a jump box, but what else has any one needed one time or another?