Some people chose to spend the night out in the hills in a simple bivouac shelter and some people will only do it as a last resort, either way there is a good chance that at some point in your outdoor career you will have to, so you might as well be prepared. So whether you intend to spend the night out in the wilderness or end up doing so in an emergency a good quality bivvy bag or emergency shelter will help to protect you from the elements and possibly save your life. Mountain Equipment, Outdoor Research, Vango and Lifesystems are renowned for their quality bivvy bags and shelters from one person to four person with a range to suit every situation and budget.
