This 4-piece Modular Sleep System (MSS) was designed for the U.S. military and is primarily used by the army and USMC. Using the components individually and in combination provides comfortable sleeping down to –30°F. Adding in some extreme weather clothing into the mix, it’s purported to accommodate down to –50°F — but that’s pretty extreme!
The bivy cover protects from wind, rain and snow even without a tent. That is just as important for your comfort as the insulation provided by the sleeping bags. And if you get some mud on anything, no worries as both sleeping bags and bivy cover are machine washable!
Military Modular Sleep System Components
- Patrol Sleeping Bag: For temperate weather 30 to 50°F.
- Intermediate Cold Weather Sleeping Bag: Alone (–10° to 30°F) or combined with the patrol bag for colder weather.
- Bivy Cover: Alone in warm weather or snapped over the patrol and/or cold weather sleeping bags as a barrier to wind, wet ground, rain, or snow.
- Compression Stuff Sack: Both sleeping bags and the bivy cover can be stuffed and compressed in this sack to a compact size.
NSN: 8465-01-445-6274 (bundle of 4 components)
All components made in USA — mostly by Tennier Industries but a few by other manufacturers.
Patrol Sleeping Bag
This mummy-style military sleeping bag is ideal for temperate weather between 30° and 50°F by itself. You can snap the cold weather sleeping bag inside it for more warmth. And you can snap the patrol bag inside the bivy cover to stay out of the wind and rain without a tent.
The heavy-duty, reversible zipper opens end to end. It has pulls on both ends so you can find the perfect ventilation at the top or bottom of the bag. You can also pull the zipper from inside or outside the bag for ease of use and exit. The slider is non-locking and will repair itself it jams or gets snagged. (Wish my winter parka did that!)
Patrol Sleeping Bag Features
- Cold Rating: 30–50° F. (used alone)
- Length: 90–92″
- Width: 36–37″ at shoulders, narrower at feet
- Material: Water-resistant, non-flammable olive green 1.9 oz rip-stop nylon shell and soft nylon inner lining
- Insulation: Polargard® HV hollow continuous filament resin bonded polyester.
- Hood: Velcro tab plus a nylon drawcord with barrel lock to adjust for heat retention
- Zipper: Heavy-duty, durable, reversible zipper by YKK
- Draft Flap covers zipper to prevent heat loss
- Foot Box: Extra space at the bottom so soldiers can sleep in their boots means lots of room for your feet!
NSN: 8465-01-398-0685
Care: Machine wash on delicate/gentle cycle in cold water; tumble dry on medium-low cycle.
Storage: When not being used in field, it is best to store it uncompressed to extend the life of the polyester insulation.
Intermediate Cold Weather Sleeping Bag
Great sleeping bag for cold weather down to –10° F by itself. You can snap it inside the patrol bag for temps down to –30°F. The mummy-style of this bag is even more critical for keeping the chill out and the foot box has double insulation to keep your feet warm. Snap the bivy cover over it if it’s windy, wet or snowing.
Cold Weather Sleeping Bag Features
- Cold Rating: –10° to + 30° F. (used alone)
- Length: 81″ max.
- Width: 33″ max. at shoulders; 18″ min. at feet
- Material: Water-resistant, black rip-stop nylon (inside and out)
- Insulation: Double layer of 170GSM continuous filament polyester fiber
- Hood: Nylon drawcord with barrel lock to adjust for heat retention
- Chest Collar: Sewn-in and quilted — prevents air drafts up and down through the hood
- Zipper: Oversized zipper for easy opening and closing (full closure with no cold spots)
- Draft Flap covers zipper to prevent heat loss
- Foot Box: Twice the insulation as the rest of the bag to keep your toes warm!
NSN: 8465-01-398-0687
Care: Machine wash on delicate/gentle cycle in cold water; tumble dry on medium-low cycle.
Storage: When not being used in field, it is best to store it uncompressed to extend the life of the polyester insulation.
Bivy Cover
A bivy sack or cover protects your sleeping bag from wind, rain, snow, and wet ground. This one is generously sized so that it can enclose either bag or both at the same time. Attach the bivy cover by snap fasteners on either side of a sleeping bag’s slide fasteners. It can also be used alone in very warm weather.
This bivy cover is made of waterproof Gore-Tex™ with heat-sealed seams to keep you dry. This fabric also breathes so your sweat can evaporate instead of condensing inside your bag. It’s totally windproof as well to keep the chill off.
Bivy Cover Features
- Protection: Windproof, waterproof, and moisture vapor permeable
- Length: 85″ max.
- Width: 35″ max. at shoulders; 28″ min. at feet
- Material: Tough, Gore-Tex™ nylon in woodland camo pattern
- Seams: Heat-sealed to keep out wind and rain
- Top: Drawcord cinch at top and velcro tab to customize protection from elements
- Zipper: Breakaway zipper on side
- Storm Flap: Snaps over zipper to protect from elements
NSN: 8465-01-416-8517
Care: Machine wash on permanent press cycle; tumble dry on low heat.
Storage: When not being used in field, it is best to store it uncompressed to extend the life of the polyester insulation.
Compression Stuff Sack
Last, but not least, is a black compression sack to stuff both bags and the bivy cover in for compact carrying and storage.
Stuff Sack Features
- Size: 11.5″ dia. x 28″ long
- Volume: One cu. ft (approximately the size of a basketball)
- Material: Water-resistant, black nylon
- Closure: Cinch/drawstring at top with barrel lock
- Compression: Multiple straps (6 lengthwise; 3 around)
NSN: 8465-01-398-5428
Care: Spot clean with damp cloth and soap.
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