Bought a Katabatic Silnylon stuff sack for my Western Mountaineering Caribou sleeping bag. The stuff sack that came with the bag was very tight and hard to pack/unpack at the end of a long day of backpacking. The Katabatic sack was one size up and it works much better-easier to stuff and still stays small and packable, weighs almost nothing.
It works for its intend ended purpose. The lead time for receiving it was very good.
Great lightweight bag at a fair price.
After years of playing the old fool school game and carrying pounds and pounds too much; I have made the jump to acquire lightweight and ultra lightweight gear. One of the pieces of this change is to use ultra lightweight bivy sacks as well to store all that new gear in. The KatabaticGear Silnylon Stuff Sack fits the bill perfectly. Light, waterproof and tough. What more can I say about a stuff sack? They work and work well.