Abstract: A multi-functional enclosure device made of four layers of compliant thin sheet material has an interior bag, and a surrounding exterior bag that opens at the bottom. Thermally insulative material can be inserted into the space between the two bags. Closeable slits disposed mid length form a portal for insertion of a user's head, thereby permitting the device to be folded upon itself and worn in a poncho mode. In other modes of use, the device can serve as a comforter or mattress, and a combined sleeping bag and bivouac shelter. When free of insulative material, the device can be compacted to a very small storage state.