Used this product this past weekend - in the larger unit I put a sweater and a fleece pullover. I wear an XL Tall and both were bulky pieces of clothing. In the past these items would have taken up too much space. I used to mid size packer for a 4 day supply of under shorts, under shirts and socks. The smaller item took care of my electric razor and toothbrush with left over space. Product provides good organization for your packed items.
We have one of the big LLBean Duffle Bags that we share on trips. It is just at 50 pounds packed so no extra charges at the airline counter. These Ultralight Packers are just the thing to keep everything tidy in the duffle bag. Although things are fairly secure it is nice to have things more organized. You can pull out one of the "packers" and not have to take everything out. They are well constructed and lightweight so won't add much to the overall weight. Great item.