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A '''sleeping bag''' is a protective "bag" for a person to [[sleep]] in, analogous to a [[bed (furniture)|bed]] and [[blanket]]. Its primary purpose is to provide warmth and insulation. It also protects, to some extent, against [[wind]], [[precipitation (meteorology)|precipitation]], and [[exposure]] to view, but a [[tent]] performs those functions better. The bottom surface also provides some cushioning, but a [[sleeping pad]] is usually used for that purpose. A '''[[bivouac sack]]''' (''bivy'') is a waterproof cover for a sleeping bag that may be used in place of a tent for lightweight travelers or as a backup if inclement weather occurs. | A '''sleeping bag''' is a protective "bag" for a person to [[sleep]] in, analogous to a [[bed (furniture)|bed]] and [[blanket]]. Its primary purpose is to provide warmth and insulation. It also protects, to some extent, against [[wind]], [[precipitation (meteorology)|precipitation]], and [[exposure]] to view, but a [[tent]] performs those functions better. The bottom surface also provides some cushioning, but a [[sleeping pad]] is usually used for that purpose. A '''[[bivouac sack]]''' (''bivy'') is a waterproof cover for a sleeping bag that may be used in place of a tent for lightweight travelers or as a backup if inclement weather occurs. | ||