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Modular Sleep System (MSS) FAQ
What is the Modular Sleep System (MSS)?
The Modular Sleep System (MSS) is the Army-issued layered sleep setup built around the Patrol Sleeping Bag, Intermediate Cold Weather Bag, and a protective bivy cover. Components can be used individually or combined based on conditions.
What are the main components of the MSS?
The MSS typically includes a Patrol Bag, an Intermediate Cold Weather Bag, a bivy cover, and compression stuff sacks. Availability can vary depending on surplus inventory.
Can I buy MSS components separately?
Yes. Many people rebuild an MSS over time by replacing missing items—Patrol Bag, Intermediate Bag, bivy cover, or compression sacks—depending on what their kit needs.
How does MSS layering work?
For the full system, the Intermediate Bag is designed to layer inside the Patrol Bag, then both are used inside the bivy cover. This order helps keep attachment points aligned for proper closure.
Do I need the correct NSN for CIF replacement?
Yes—if you’re replacing CIF-issued gear, contact Smiths Surplus before ordering to confirm the correct NSN, manufacturer, and configuration required by your unit.