The arctic sleeping bag is used in extreme cold weather. It consists of two down and feather filled cases, the inner one being a regular mountain sleeping bag. The outer case has a hood and a full mummy shape and is closed with snaps. The two cases may be tied together by means of the tapes at the foot of each bag. When the weather is only moderately cold and it is important to cut down on weight, the outer case may be left at the case. It weight 12.00 lbs.
The 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. 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 water repellent sleeping bag case is made of poplin and provides a wind-resistant cover for the sleeping bag. It is ordinarily used with all sleeping bags. In warm weather, when little protection is needed, the case may be alone. Two openings in the seam at the foot of the case allow the tie straps on the sleeping bag to to be drawn to the outside to hold the items in a compact unit when rolled. It weighs 1.88 lbs.
The sleeping hood is intended to be worn on the head to keep the head area of the sleeping bag clean from head oils, perspiration and dirt.
The sleeping mat is intended for use as a ground cover in conjuction with the sleeping bag.
The self-inflating sleeping mat is intended to insulate from the cold and moisture of bare ground when placed under a sleeping bag, and also to cushion its user from obtrusive objects when lying on the ground.
The pneumatic mattress is inflated by mouth and is intended for use in conjunction with sleeping bags.
The insulated pneumatic mattress is inflated by mouth and is intended for use in conjunction with arctic and mountain sleeping bags.
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 water repellent sleeping bag case provides a wind resistant, water repellent cover for a sleeping bag.
The M-1949 arctic outer shell sleeping bag is designed to fit over the mountain sleeping bag 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.