This US. GI. four part modular sleep system was designed to be used together, or you can use it separately for warmer conditions. Here’s what’s included- One Compression sack (light sage) for compact storage, one cold weather patrol sleeping bag (light sage), one intermediate sleeping bag (dark sage), and one waterproof/breathable Bivy cover (ACU Digital) to keep the whole system dry. This system was designed in layers to trap in pockets of air and heat. The complete system, including the compression sack weighs roughly twelve pounds