Not sure why the bad ratings
These compression sacks are the bees knees, pretty simple really; a good stuff, pull the top over, and cinch. Thats that. They are very durable, last hike I went on it ended up outside of my pack because my friends pack broke halfway through so we all picked up the extra gear, it rained, and we were bushwhacking through some pretty heavy forest, the sack came out without a tear or snag while fully compressed. I picked up a few more for various other gear.
Photo is of the 2XL stuffed with a kelty mistral sleeping bag.