A sleeping bag (1; 101) comprising: a zipperless, elongate shell (3; 103) defining an inner volume sized and shaped to receive a user therein, the zipperless, elongate shell (3; 103) having a head portion (5; 105), a foot portion (7; 107), a middle portion (9; 109) extending longitudinally between the head and foot portions, an overlying portion (11; 111) adapted to overlie the user during use, and an underlying portion (13; 113) adapted to underlie the user during use, further comprising a head end panel (15; 115) located in the head portion (5; 105), a foot end panel (17; 117) located in the foot portion (7; 107), and a pair of spaced side panels (19; 119) located in the middle portion (9; 109), extending longitudinally between the head end panel (15; 115) and the foot end panel (17; 117); a hood (21; 121) being located in the head portion (5; 105) of the zipperless, elongate shell (3; 103), characterized by the hood (21; 121) including a catenary opening (23; 123), the head portion (5; 105) including a support member disposed between the catenary opening (23; 123) and the head end panel (15; 115) and extending from one of the side panels (19; 119) to the other, the support member being attached to each of the side panels (19; 119) and the head end panel (15; 115), an edge adjacent the catenary opening (23; 123) being free; and the support member providing support to the head portion (5; 105) such that the side panels (19; 119) and the head end panel (15; 115) of the zipperless, elongate shell (3; 103) do not collapse and the catenary opening (23; 123) hangs freely, and such that the overlying portion (11; 111) of the zipperless, elongate shell (3; 103) adjacent the catenary opening (23; 123) is spaced from the underlying portion (13; 113) of the zipperless, elongate shell (3; 103) when the sleeping bag (1; 101) is laid out for use. a zipperless, elongate shell (3; 103) defining an inner volume sized and shaped to receive a user therein, the zipperless, elongate shell (3; 103) having a head portion (5; 105), a foot portion (7; 107), a middle portion (9; 109) extending longitudinally between the head and foot portions, an overlying portion (11; 111) adapted to overlie the user during use, and an underlying portion (13; 113) adapted to underlie the user during use, further comprising a head end panel (15; 115) located in the head portion (5; 105), a foot end panel (17; 117) located in the foot portion (7; 107), and a pair of spaced side panels (19; 119) located in the middle portion (9; 109), extending longitudinally between the head end panel (15; 115) and the foot end panel (17; 117); a hood (21; 121) being located in the head portion (5; 105) of the zipperless, elongate shell (3; 103), characterized by the hood (21; 121) including a catenary opening (23; 123), the head portion (5; 105) including a support member disposed between the catenary opening (23; 123) and the head end panel (15; 115) and extending from one of the side panels (19; 119) to the other, the support member being attached to each of the side panels (19; 119) and the head end panel (15; 115), an edge adjacent the catenary opening (23; 123) being free; and the support member providing support to the head portion (5; 105) such that the side panels (19; 119) and the head end panel (15; 115) of the zipperless, elongate shell (3; 103) do not collapse and the catenary opening (23; 123) hangs freely, and such that the overlying portion (11; 111) of the zipperless, elongate shell (3; 103) adjacent the catenary opening (23; 123) is spaced from the underlying portion (13; 113) of the zipperless, elongate shell (3; 103) when the sleeping bag (1; 101) is laid out for use.