The Snugpak Compression Stuff Sack is perfect for separating and storing items in your pack. These compression stuff sacks are like the ones supplied with Snugpak sleeping bags and make perfect replacements or can be used for other sleeping bags, cold weather clothing, or any other bulky items. Compression stuff sacks are simple, top loading, drawstring designs with four compression straps running along the sack vertically. Generally, these bags can reduce the bulk of an item by about 30% to 50%.