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4-Part Modular Sleep System

$453.99 List price:

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.


NSN: 8465-01-445-6274 (4-Part Modular Sleep System)

The 4-Part Modular Sleep System sleeping bags and other components are constructed to be used in conjunction with each other, or separately to complete an interoperable system known as the extreme cold weather sleeping bag. The MSS is designed to provide comfort in temperature ranging from 50??F to -30??F when wearing various layers of extreme cold weather clothing.

  • Camo Green Patrol Bag
    • Temperatures to +30°
    • Reversible double-pull (opens end to end) slider allows top or bottom ventilation
    • Non-locking slide fastener self repairs if jammed or snagged
    • Draft flap prevents heat loss
    • Hood adjusts for heat retention; includes nylon drawcord and barrel lock
    • DIMENSIONS: 92.00" x 37.00"
  • Black Intermediate Bag
    • Temperatures to -10°
    • Free from cold spots
    • Insulation does not migrate in the bag
    • Anatomically designed foot box contains twice the insulation as the bag
    • Sewn-in, quilted chest collar prevents air drafts up and down through the hood
    • Hood adjusts for heat retention; includes nylon drawcord and barrel lock
    • DIMENSIONS: 87.00" x 35.50"
  • Woodland Camouflage Waterproof Bivy Cover
    • Made from waterproof, moisture-vapor-permeable material with all seams heat sealed
    • Includes snap fastener and slide fastener
    • DIMENSIONS: 85.00" x 28.00" x 35.00"
  • Black Stuff Sack
    • Constructed of water resistant materials
    • Compressible to one cubic foot
    • Six 1"-wide nylon webbing straps adjust by ladderlock buckles
    • Reinforcement webbing is sewn around the circumference of the bag
    • Nylon drawcord closure with a barrel lock
    • DIMENSIONS: 30.00" x 14.00"


Write Review

  1. Start With The Best, Forget The Rest. 5 Star Review

    Posted by

    This is simply the best bag i have ever had. I have owned a few others inc the army issue icw, adn ecw bags. I bought one of these to try out, i now have 3. I will be placing orders for 2 or so more of them. As i change out my other family members bags' for this one. I use it with the 1in self infateing sleeping pad, it will fit inside the cover and below the sleeping bag so you get to stay on top of your sleeping pad all night instead of wakeing up next to it. Having 3 bags in one you cove a wide range of climents, but if you still need colder buy an additional patrol bag and snap into the system or the fleece liner. I have not needed to do this. So far i have used this bag at temps as hot as 90f and as cold as -10f. The olny fault i could find was the cover is made to pull completly over your head so teh bag can shed water. This will be very nice if im cought out with it and no other type of shelter, but most of the i don't like the cove tring to ride up onto my face. I solved this with a small pice of velcro. Giving me the option of the cover staying up or down.

  2. Last Bag I Will Ever Need 5 Star Review

    Posted by

    I have owned this sleep system for a few years now and i have to say its the best on the market. I have read the other reviews pertaining to this product and i have one thing to add that i feel was left out. Its true the weight of the system is on the heavy side but, if you are a year round hiker like me this system will actually lighten your pack. I used to carry a small tent to keep out of the elements and a sleeping bag. But now thanks to this system i can enjoy the outdoors in any weather and not have to lug a tent around with me. Also i happen to know that the product advertised on this site is 100 percent authentic military issue. I read some of the others commenting on price but, in this instance you get what you pay for. There are a lot of people selling knock off versions of this system that look very alike. But in my experience u.S. Cavalry can be trusted.

  3. The Bag I Never Leave With Out 5 Star Review

    Posted by

    I bought this sleeping bag in 1988 i slept in my truck on a hunting trip and it snow. When i got home i bought this bag and never look back, i have used this bag every where i went in the last 20 years. It have used in the very cold and the warm weather in 15 deffert states. The bag still look the same the only deffert is the booties and the hat that i have never used

  4. Pay 400 For This? 5 Star Review

    Posted by

    Fantastic set-up- warmest sleep system on earth in my opinion. But, 400 + dollars for it? I don't think so! I bought my us military genuine ecws sleep system on e-bay for 100.00, Delivered. If you have money to burn buy one here but they can be had, same quality, cheaper elsewhere. Merry christmas!

  5. Great Bag 5 Star Review

    Posted by

    Best bag i have ever owned. Great versatilitty. Would give it a 5 but price too high and bag with all components too heavy (approx. 16 Pounds). Loved mine from the corps so much, bought one before i left. Aside from down side, would never give it up. (Fyi... About $240 at cash sales).

  6. Awesome Awesome Bag 5 Star Review

    Posted by

    I purchased one of the sleep systems when i first got it i tryed it out it was a little tight one of my buddys bought it off me and i ordered another 97x37 all i have to say is wow i'm a big boy and i can stretch out no problem we resently went out to the the rock front every thing going good. Well the weather changed started getting cold and a lil wet got in my bag as soon as i got in it started dumping for at least five or six hours well when i woke up i had a inch of ice on my bag but the bag kept me dry and warm i give it a five but if you do long hikes it is a little heavy 15 lbs. But well worth the investment big jon

  7. Really Comfortable In Soggy, Cold Weather. 5 Star Review

    Posted by

    I've had any number of sleeping bags over the years i've been hunting (almost 40) and this sleep system not only makes the most sense in terms of versitility but it really functions well in the kind of day after day cold soggy weather n.Michigan is famous for. We all know goose down is a bust in these conditions, but so are some of the other synthetics used to fill sleeping bags, even expensive ones from stores like rei. I hunt every year on an island in lake michigan which is a wilderness area where open fires are not permitted. A slow drying bag in this setting is not funny. No problema with this set-up. Like wool, it will keep you warm even if it is damp, and both bags air dry quickly. Had it not been for the rather cramped shoulder area, i would have given it 5 stars.

  8. Awesome Sleeping System 5 Star Review

    Posted by

    This sleeping system is the best that i have used. This is marine corps issued. We used this sleeping system in cold rainy weather with temperatures as low as 17 degrees in camp pendleton, ca. Use it in conjunction with the sleeping pad and you will never be cold again.