There is not much you can do about the great british weather, but you can be prepared for it. The Vango Medium raincover fits neatly over the outside of your rucksack to help keep your essentials dry. The large will fit rucksacks that are 40 - 55 litres. It's nice and bright too, so you can be spotted easily should you need to be. Ideal for Duke of Edinburgh awards and Ten Tors. The cover packs away nice and small as well when you don't require it.