These compression sacks are what make the US's Modular Sleep System so compact. Made by Tennier industries (as with the rest of the MSS), these stuff sacks are made to hold the patrol bag, but are compatible with most off-the-shelf sleeping bags that go down to 30°F. You might also find that these are fantastic for compressing many garments, pillows, or a sleeping mat as well.

What does a stuff sack do? One of the most overlooked parts of cutting down bulk in your gear is also what takes up 90% of the space - Air. Like a bag of Lays, there's a lot of air in sleeping bags despite what you may be thinking (or hoping) is inside. Most sleeping bags, but the MSS in particular can actually scrunch down significantly smaller when you force that dastardly atmosphere out of it. The stuff sack cinches down on all sides with durable nylon straps to compress most bags down to about a cubic foot, and the large variant of this bag can hold 2-3 pieces of the modular sleep system within a ~2'x1'x1' area.

How To Stuff It

The following information is on the tag, but we'll host it here for the sake of redundancy.

Tightly fold and roll the modular sleeping bag and place into the compression stuff sack.
Place flap over the modular sleeping bag and pull the drawcord tight to close the stuff sack.
Adjust the compression straps to maximize compression

Keeping The Stuff Sack Clean

Brush and clean the modular sleeping bags before placing into the compression stuff sack.
Remove dirt and grease from the compression stuff sack by spot cleaning with a damp cloth and soap.

Specs

Made in the USA
Compatible with nearly any sleeping bag, made for USGI MSS (not included)
Small stuff sack carries 1-2 pieces of the MSS
Large stuff sack carries 2-3 pieces of the MSS
Made with water resistant nylon
3 vertical ladder-lock straps for compression, 1 fastex buckle strap
2 horizontal ladder-lock straps for compression
Drawcord cinch with barrel cord lock
Foliage Green

Condition

Excellent: Compression sacks are in excellent condition with no stains, tears, rips, or holes. Minor signs of use may be present, but sleeping bags are fully functional.

Serviceable: Compression sacks show more general wear than the Excellent condition, and may have more worn hook&loop fields on the flap of the sack.

Camping Gear

French F1 Tent

USMC MARPAT Shelter Half

USGI Patrol Bag Compression Sack