Nice material, easy to fill, easy to wrap around, and sturdy once they're in place.  I wouldn't use these for thin-legged canopies because when you wrap these around, the bags will touch each other and the velcro strap will be left hanging around if you don't use it all.  The thicker legs of a bigger canopy/gazebo fit this item better because when you wrap these around the legs, the space/gap in the middle is a good size for the leg and the velcro will only tighten up to a certain point.  The more slack you have, the less "snug" these will be - hope that makes sense.  You need a bigger leg to fill the gap more and make these more tight when you wrap the velcro around.  Good bags, though - I thought the price was reasonable and I would buy these again if I needed to.