The versatile and incredibly compressible Marmot Kompressor Backpack acts as a stuff sack for your sleeping bag during your trek but works as a rucksack when you want to take an ultralight trip to a nearby summit. Three effective compression straps shrink down your lofty load to its smallest possible size for packing away in a larger pack, and the removable closed-cell foam back sheet and an integrated hydration sleeve give you the ability to use the Kompressor as a small day pack.