They work great! I have to switch between my summer and winter clothes every year. Not enough closet space. My fleece vests come out just fine. They may have a few wrinkles in them at first but they fall out quickly. As far as sealing-you have to use the slider to seal the bag. If you don't get a good seal it will fill back up with air and expand. Also small holes will allow the air to come back in. I use a piece of scotch tape and it works great. I highly recommend them. Definitely a space saver. :thumbup: :thumbup: