I used these for a trip to compress my clothing to smaller suit cases. They worked like a charm. They removed so much air and they fit into suitcases really easy.The trick is not to fill them with lots of clothing, I bought the big pack so I could fit a day or two of clothing in each one and press the air out. This worked out great as they then laid flat into the suit cases. This was very helpful in case my went over 50 pounds then I could transfer a couple bags over to the other suitcase. But I did not need to do that thankfully. But keeping the with just a couple days of clothing in them also helped to release the air easier.Just a note for you all, this did make the clothes really wrinkled, but a little wrinkle release from Downy did the trick to get them out. Or you can iron them. Since I am a jeans and tank top type of person the wrinkles were easy to iron or spray out.This really is a must if you want to travel by air and want to use the medium suitcase as it does fit a lot doing it with these. My large suit case was 46 pounds and my medium was 42, so I fit a lot in.Tip to getting the air out easier. I tried to roll them as it stated, but that pretty much bunched the clothing up at the end. Then I slowly started folding the bag in half, squeezed most of the air out and then started rolling it like stated in instructions. This way I did not have it all bunched up. Then if you shake the bag after air is out and flatten it by hand it does mover the clothing easy so you have a even laid out bag. If you want to fold the bag like I did you will need to place some of the clothing sideways at the back and then the front so you are leaving a space to fold the bag. Hope these tips help you, it was trial and error but I got the hang of it.