The bags are nice and sturdy. The zipper works well. I love the size, it is exactly what I need for organizing my fabrics, yarn, and all kinds of craft projects. In the beginning though, the vinyl is really stinky! The odor is so pungent, I don't know how anyone would dare to store anything in those bags before allowing them to off-gas. It's understandable that some people hate that and give them a bad review. Maybe the manufacturer should put a big label on the package "Air out for at least a week before using the bags!" I took a picture to show how I did that. It wouldn't be enough to lay them around and hope for the best. If you hate any chemical odors, you need to open the bag in a way that the air can go in and out, and leave the bags in a well ventilated room for a while. I actually had to wait for two weeks before they became satisfactory for me. With all that trouble I still give them 5 stars because they are exactly what I needed and I am going to buy another pack.