Never put the sleeping bag outside of your pack. You will lose it if you fall or soak it if it rains.
Never bring hand held flashlight. Always choose a headlamp.
Be sure to bring other essentials like maps, compass, lighter, food(to cook and ready to eat, both.), sleeping mat, rain jacket, and other weather resist equipments.
Depending on the terrain, you will need ropes, crampons and ice axe along with associated skills.