The all purpose liner (APL) is an improved poncho liner with a zipper closure.

The poncho liner is a polyester batting article covered with 3 plys of ripstop nylon, and is intended for use as a sleeping bag when used with a poncho, or as a blanket. The liner has eight tie tapes fot attaching it to the poncho.

The extreme cold weather sleeping bag is for use in locations where mean monthly temperatures are below +10°F.

The intermediate cold weather sleeping bag is for use in locations where mean monthly temperature ranges from +45°F to +10°F.

The 3 season sleep system (3S) is a single sleeping bag system that is lighter in weight and provides increased environmental protection for all environments except extreme cold weather.

The Extreme Cold Weather Sleep System (ECWSS) will provide environmental protection between +40°F and -45°F (+5°C and -46°C) and is intended to be used with the foam sleeping mat.

The Intermediate Cold Weather Sleeping System is an ICW version of the extreme cold weather sleeping system.

The Modular Sleep System is designed to insulate the user in environments ranging from mild weather to extreme cold weather.

The M-1942 arctic sleeping bag consists of two down and feather filled cases for use in extreme low temperatures. The inner bag is mummy shaped. A full length zipper is used to close the quilt shaped outer bag. A waterproof wrap case, having flaps and tie tapes, is provided for carrying both rolled bags.

The M-1942 mountain sleeping bag is a mummy shaped, down and feather filled sleeping bag, made in regular and large size, in which an over-lapping tube construction prevents the entry of cold air at the stitching. The shape and design gives maximum warmth with minimum weight. Tie straps are attached to the foot of the bag. A waterproof bag is provided for protecting the rolled bag. The regular bag weighs 5.75 lbs. The large bag weighs 6.00 lbs.

The wool sleeping bag was originally made of knitted wool cloth, which was replaced by a woven, 21 1/2-ounce napped wool cloth because of the extreme shrinkage occurred when laundered. It was mummy-shaped and provided with a 30-inch heavy slide fastener.

M-1945 arctic sleeping bag consists of two sleeping bags: outer casing and inner casing. Both have full-length opening with zipper and eyelets for lacing the water repellent case.

M-1945 mountain sleeping bag is identical with inner component of M-1945 arctic sleeping bag.

The M-1949 arctic sleeping bag consists of two mummy-shaped sleeping bags: outer bag and inner bag. It is for use in temperatures of 14°F and below.

The M-1949 mountain sleeping bag is intended for use in locations where temperature ranges from 14 to 50°F.

Commercial item description A-A-55116 covers the requirements for one type and size of sleeping bag with hood.

Commercial item description A-A-55262 covers a modular sleeping bag system that consists of a patrol sleeping bag, an intermediate cold weather sleeping bag and a compression stuff sack to carry the complete system.

Military specification MIL-B-10721 covers the requirement of the M-1949 mountain and arctic sleeping bag.

Military specification MIL-B-830 covers the requirement of the M-1949 mountain and arctic sleeping bag.

Military specification MIL-L-43335 covers liners for the wet weather ponchos.

Military specification MIL-S-43880 covers the requirement for one type and size of sleeping bag with hood for extreme cold conditions.

Military specification MIL-S-44016 covers the requirements for one type and size of sleeping bag with hood for intermediate cold conditions.

Military specification MIL-S-44309 covers sleeping bags for use as part of the extreme and intermediate cold weather sleeping systems.

Military specification MIL-S-44361 covers a complete extreme cold weather sleeping bag system.

Military specification MIL-S-44429 covers a complete intermediate cold weather sleeping bag system.

Joint Army-Navy specification JAN-S-647.

Purchase description GL/PD 07-09 covers a modular sleeping bag system that consists of a patrol sleeping bag, an intermediate cold weather sleeping bag, a waterproof bivy cover and two compression stuff sack to carry the components of the system.