Very interesting to see what people carry.  As for me, lens cleaner, extra batteries, extra memory card and eyeglasses.  Depending where I go....Trekpod or tripod, walking sticks, hydration system, two-way radio, gps, compass, sunscreen, hat, dark glasses, mask, first aid kit, raingear, jacket, Ziploc bags, plastic waste bags, toilet paper, gloves, trail mix, light snacks, energy gels, Excedrin/aspirin, headlamp, extra clothing, watch, mirror/reflection device and sometimes a friend.........Aloha.....Errol