Ashwin Lewis
The US Marines use sleeping bags that are designed for mild and extremely cold weather. These sleeping bags are typically part of a two-bag system consisting of a warm-weather bag and a bag designed for temperatures as low as zero degrees Fahrenheit. When integrated, these two bags can handle temperatures as low as minus 20 degrees Fahrenheit. This system is known as the Flexible Temperature Rated Sleep System (FTRSS) or the Fortress System, and it has been in production for almost 30 years. The sleeping bags used by the US military are designed to provide increased protection from the elements, with features such as increased padding to level out the ground and waterproof capabilities.
| Characteristics | Values |
|---|---|
| Name | US Military Modular Sleep System (MSS) |
| Type | Two Mummy-style sleeping bags, a bivy cover, and a stuff sack |
| Variants | Patrol and Intermediate Cold Weather |
| Functionality | Each sleeping bag is fully functional and can be used independently |
| Protection | Increased protection from the elements with features like increased padding to level out the ground and waterproofing |
| Temperature Range | Designed for mild and extremely cold weather, with some variants suitable for summer use |
| Size | Compresses to a small size for portability and has ample room for comfort |
| Weight | Lightweight construction |
| Durability | Tough and durable |
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What You'll Learn
The US Military Modular Sleep System (MSS)
The Patrol bag is lightweight and perfect for summer use, providing good warmth as a layer. It can be used independently or snapped together with the bivy cover for added protection from wind and rain. The bivy cover is made of Gore-Tex material and helps to keep out the wind and add another layer of heat.
The Intermediate Cold Weather bag is designed for extremely cold weather and can be used on its own or in conjunction with the Patrol bag. Together, the two bags can provide warmth in temperatures as low as -20 degrees Fahrenheit.
The US Military Modular Sleep System is designed to offer increased protection from the elements, with features such as increased padding to level out the ground and waterproof capabilities. It is a versatile and durable system, providing comfort and warmth in various climatic conditions.
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Mummy-style sleeping bags
The US Military Modular Sleep System (MSS) consists of two Mummy-style sleeping bags, namely the Patrol bag and the Intermediate Cold Weather bag, along with a bivy cover and a stuff sack. The MSS is designed to be used in both mild and extremely cold weather. Each sleeping bag can be used independently and offers more protection from the elements than a typical sleeping bag. For example, the MSS sleeping bags may offer increased padding to level out the ground and may be waterproof.
The Patrol bag is thin and lightweight, making it perfect for summer use. It can be snapped together with the bivy cover, which provides an additional layer of protection from wind and rain. The Patrol bag is also comfortable and has plenty of room, making it a good option for those who feel claustrophobic in traditional Mummy-style sleeping bags.
The Intermediate Cold Weather bag is designed for colder temperatures and can be used in combination with the Patrol bag for even greater warmth. Together, the two bags can provide protection in extremely cold temperatures.
The Mummy-style design of the MSS sleeping bags is an important feature, as it helps to trap body heat and keep the user warm in cold conditions. However, it is important that the sleeping bag does not trap too much moisture, as this can also lead to a loss of body heat and, in extreme cases, hypothermia. Overall, the MSS sleeping bags offer a versatile and functional option for those who need a reliable sleep system in a range of climates.
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Two-bag systems
The US Military Modular Sleep System (MSS) consists of two Mummy-style sleeping bags, a bivy cover, and a stuff sack. The two-bag system was created by Wiggy's, a company that has been making sleeping bags for the military since 1991.
The two sleeping bags in the MSS are the Patrol bag and the Intermediate Cold Weather bag. Each bag is fully functional and independent of one another. The Patrol bag is thin and lightweight, making it suitable for summer use, while the Intermediate Cold Weather bag is designed for colder temperatures. When used together, the two bags can provide warmth in extremely cold weather conditions.
The MSS also includes a bivy cover, which is a waterproof and windproof layer that goes over the sleeping bag to provide additional protection from the elements. The stuff sack allows the sleeping bags to be compressed and easily carried.
The two-bag system offers several advantages over a single-bag system. It provides increased flexibility, allowing users to adjust to varying temperature conditions by using one bag or both bags together. Additionally, the two-bag system can provide added warmth and protection, which can be crucial for soldiers operating in extremely cold environments.
The two-bag system has been modified several times over the years to improve its performance, and it continues to be a popular choice for military and outdoor enthusiasts alike.
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Waterproof capabilities
The US Military Modular Sleep System (MSS) consists of two Mummy-style sleeping bags – the Patrol and Intermediate Cold Weather – a bivy cover, and a stuff sack. The MSS is designed for mild and extremely cold weather, with the Patrol sleeping bag designed for more temperate climates, ranging from approximately 30 to 50 degrees Fahrenheit, and the Intermediate sleeping bag rated for temperatures between 10 and 30 degrees Fahrenheit.
The MSS's bivy cover is waterproof, and the system can be compressed into a cylindrical shape to fit in the bottom of an ILBE main pack. The waterproofing quality is achieved by using stitchless technology, and packing is facilitated by having a smooth surface on both the inside and outside of the bag.
The MSS is also available with a Gore-Tex bivy, which can provide a good night's sleep down to +40-50 degrees Fahrenheit without polypro or fleece. When paired with a wicking Polypro base layer and a poncho liner, the temperature can be lowered to the high 30s.
The US Military also has an Improved 5-Part ACU Digital Sleep System, which consists of two Mummy-style sleeping bags constructed from water-resistant, ripstop nylon.
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Compression sacks
The USMC Sleeping Bag Waterproof Compression Sack is specifically designed and used by the Marine Corps to keep their sleep systems dry and compressed when not in use. This compression sack is made in the USA and features stitchless technology to ensure waterproofing. It has a smooth surface on both the inside and outside, facilitating easy packing.
The compression sacks used by the US Military are large enough to fit two full-size sleeping bags and can even accommodate a sub-zero bag. They are constructed with durable fabric and offer a significant amount of capacity. The sacks are well-suited for storing and transporting sleeping systems, keeping them compressed and dry.
It is important to note that some users have reported issues with the quality of the straps and buckles on the compression sacks. There have been instances of broken buckles and concerns about the durability of the straps. However, the majority of customers find the sleeping bag well-made and functional, offering good value for money.
While compression sacks are useful for storing and transporting sleeping bags, it is recommended not to store the sleeping system in the compression sack for extended periods. This is because the light, puffy, airy insulation in the sleeping bag needs to remain fluffy to effectively trap and warm the air using your body heat. Compressing the sleeping bag for long periods can impact its ability to provide adequate thermal insulation.
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Frequently asked questions
The USMC uses a two-bag sleep system, consisting of a bag for warm weather and a bag that would perform at 0°F. When integrated, the two bags can perform at -20°F. This system was created by Wiggy's, a company that has been making sleeping bags for the military since 1991.
The two sleeping bags in the system are called the Patrol bag and the Intermediate Cold Weather bag.
The sleeping bags are light, thin, and durable. They are also very comfortable and can be snapped together. The Patrol bag is good for use until early winter, depending on where you live.
