Marine Corps Sleep System Training Video 

I wish they had a video like this for the woodland camo version of the Modular Sleep System. I love my woodland MSS, my favorite piece of gear.

That new bivy sack is a home run, but the bag itself is not nearly as warm as the old system. The compression sack is a wonderful piece too. The old system with this new compression sack and new bivy sack would be ideal for me

I absolutely love this system. There does not seem to be a huge difference between the MMSS green patrol bag and the 3S brown bag other than the location of the zipper and hood. It seems to weigh the same and feels about the same thickness. The MMSS black bag feels a bit thicker and slightly heavier than the 3S black bag but I honestly cannot tell the difference in warmth. Any time I take the complete system (MMSS or 3S) I always sleep in layering underwear and do just fine. The warmer the temps the less I have to carry (leave the black bags home) and the less I have to wear inside the bag. Where I live it rarely gets into single digit temps, but, when it does, I'm warm in either of those two systems wearing thick wool socks, fleece bottoms, t-shirt and sweatshirt (or polypro) and beanie. Sometimes I'll add in the poncho liner, especially when in my hammock, and sometimes not. I like the new system slightly more than the old, after the 3S has a better bivy, better compression sacks, and the bags themselves are comparable to the older MMSS.

That is a nice sleep system and the Marines must love it so much when going to the field. I remember when I was in the Air Force and stationed at Minot AFB and got to know some guys assigned to the Air Defense Command and they lived in two story barracks. Some of the windows was broken out in their barracks and my friend had to sleep in a sleeping bag, but the system was not the best and it got really cold there in Winter.

The old Marine issue mummy bags were super warm, but so big you could not effectively carry them in an alice. We used them in base camp on cots but many of us bought civilian mummy bags like those used by mountain climbers that we could compress and carry. These look great, glad to see Marine equipment being modernized......

The Canadian Forces sleeping bags are awesome. Having the inner and outer with a bivy and a good ground layer will keep you nice and warm in -30 and colder.

I remember that bivy sack mesh cover saving me from the brutal Arizona flies.

A buddy of mine had a military grade, feather filled sleeping bag. It was so hot, and so heavy that I couldn't sleep in it! It was probably an extreme cold weather bag. But, boy did that thing warm me up! Talk about insulation.....

Literally having a conversation with another soldier. Was going to upgrade from the older green-black-camo MSS, ... but after reading more than a few reviews from marines disliking the newer system - I'm probably going to stay with the old mainstay.

Interesting to watch. I have the British version of the older MSS and I wouldn't mind those one way valve stuff sacks. I wouldn't swap the bags though.

Damn this is more modular than our "modular" sleep system 😂

That system just does not have the Low Rating for real Cold temps, I have the Snugpak Antarctica 2c which was replaced with a new name being the Antartica RE, With a comfort rating of -20*c/-4*f down to -50*c / -58*f, Although many claim that they felt cold the lower rating is a survival rating not a Dreamland rating, I know of one person who used it in -56*c which is -68.8*f and survived, But the thing is that was without another 3 season bag added to it, If I did what they say here and added a 3 season bag plus my Parka and Bibs etc I would Roast even at -50 and below, I think my bag and the Bivvy Shown here would be the Ideal setup if I was going to sleep in heavy under layers But any of my Parkas etc would be over kill for sure, Great Video and thank you for posting It, Stay Safe. Thumbs Up.

One thing I would do if I could go back is teach my Marines how to properly use their gear. We go to CIF and get all this stuff and no one ever shows you how or when to use it. It is a waste because the military puts so much time and money into R&D and then all the gear gets misused and then it has a bad rap. The other issue is that commanders are not doing proper research when it comes to planning unit training. I remember going to Bridgeport for Mountain Warefare Survival Training with only the three season bag and basic warming layers. It was so cold and back then I blamed the gear. Who knew there was a cold weather bag and more waring layers.

Good one! :)

Where do you get that improved sleeping mat?

Disculpe donde puedo comprar el Bivy sack ??? Lo estado buscando por mucho tiempo !

"completely water resistant"... is that like "fully semi automatic"??

❤️❤️❤️

thanks for the info

how could i purchase this directly not in bulk

I can not remember how many times my unit has been to the field during winter with just that 3 season bag and basic warming layers in temperatures lower than 10 degrees. It wasn't till 2 or 3 years later that any of us ever learned that the extreme cold weather bag even existed. We were fucking pissed that we had been going to the field for 3 years with 6 inches of snow on the ground and freezing our nuts off that practically the whole damn unit filled anonymous grievances to the brass. Apparently got worked because there was an enormous ass chewing to every one e-6 and above when the battalion CO came down for a surprise inspection. Supply guys knew what was up when the first thing he asked to see was our cold weather gear. The new system sucks plain and simple. The old system was big and bulky if you were taking the whole system with you but only an absolute nutter would take the cold weather bag to the field if they knew they didn't need it. The old system was warm PERIOD.

4 years in and I've never learned how to fold and store that thing or the sleep compartment in the ilbe just shoved that thing wherever 😐

Any idea how much this system weighs?

Which insulations are used? Down, synthetic?

Damn. This is a nice sleeping bag.

Where can I get the same system without joining the USMC

I saw a former US Marine that had a ...bugs off....pop up shelter....do these still exist and can they be purchased...

how heavy

Does the new cold weather system not include the gortex cover anymore?

Ohhh it finally makes sense why we're so good at War. Happy Suits 😃🙂👍

When is the poncho liner used? And what layer does the poncho go into?

Can anyone that read this tell me where i can get all of this and if someone outside U.S can buy it?

The Marines switched to this sleep system for 2 reasons. 1 cost.(got tired of paying for gortex). And 2 wanted soldiers to sleep for 5 hours no more. (After 5 hours your too cold and wake up.) Campers and survivalists stay away from this set up. How does 2 different colors for different heights make sence?

is there a user guide for the user guide tho? lol

Lighter, yes but shit compared to the older system.

they make better bags you can get to stay warm in extreme cold without combining 2 bags and dressing like an eskimo just to stay warm in a bag. they must not be that well insulated.

Nearly 20 mins to explain a sleeping bag. Love the govt. "System won't perform as designed without these things that we didn't give you with it." lol