The Survival Bag by Highlander is a lightweight bright orange High-Viz heavy gauge plastic survival bag that stores in your rucksack just in case things do go wrong on the hill. They come in one or two person options - the single is 90 x 180cm and the double is 120 x 210cm. Bright Orange for High Visibility even in bad weather. basic survival instructions are printed on the bag. Use as a survival Bivi Bag or short term shelter. Really is one of those bits of kit you will not value until the day you have a fall or get caught out in a foul weather.