Make big puffy, airy things small so you can stuff more shit in your big bag to break you back.

Thanks Stuff Sack!  

Available in Large, Small, Black and Foliage.  All used, surplus.  Between Grade 1 and Grade 2 should have all buckles and strappy bits.

Large size stuff sacks can fit the three other pieces from the Modular Sleep System:  heavy sleeping bag, light bag, and bivvy.  The small size is suited to jackets and light sleeping bags.