It is a wonderful idea to require a second pair of prescription contacts to store in your outdoor survival gear. Lenses can come out, especially during rigorous activity, and if this comes about when you use the side of a cliff you'll see no going back to locate it. The worst case would be not that have an extra associated with contacts and being unable to Sporting Accessories see. May possibly lead to cause an enormously dangerous situation for both you and for other people you are climbing and...