I have a small cloth coin purse to carry the following: driver's license, bank card, medical insurance card, and at least $5.00 cash. That pretty much covers me for about any emergency. The cash is in case I want to stop for more gatorade or a snack, or in case I want to reward someone for helping me out. Out on the trail, about 5 miles from the truck, I flatted, and my spare tube was faulty. Neither one could be adequately patched, and a nice guy stopped by and gave me his spare tube. I gave him the 5 to buy himself a new tube, and was so grateful I didn't have to walk 5 miles to the truck!