Describe the importance of bivvy bags in survival gear.

Bivvy bags are an essential component of survival gear primarily because they provide insulation and protection against the elements. In survival situations, the ability to maintain body temperature can be critical to avoid hypothermia, especially in cold or wet conditions. Bivvy bags are designed to be lightweight yet effective in forming a barrier against wind, rain, and snow, thus helping to retain warmth. They offer a compact shelter that can be quickly deployed, ensuring that individuals have a temporary safe haven when exposed to harsh environmental conditions.

While bivvy bags do not function as navigational aids, they do not carry extra gear intrinsically, nor do they assist directly in maintaining hydration. Their primary purpose is to create a protective environment that can significantly increase the chances of survival in adverse weather conditions.