These bags are used to basically save you space in your bags. How they are used is that you simply put your winter clothes (jackets, coats, sweaters, hoodies, …) because they take more space than others, but you can or actually should put all of them, into those bags and then with your vacuum, you suck the air out of those bags using the designated area and voila your clothes are trapped in an extra thin bag that would not take as much space. Before I bought them, I had two concerns: the first one Is that honestly I don’t believe that it actually works, I thought the vacuum bags would just pop open after I close them. The second concern is that I was afraid the clothes would come out wrinkled or might even be ruined if I cram them in a bag that trap and leave them no air to breathe in. I was helping my friend to unpack and I saw that she had all her clothes in these vacuum bags, the bags were very stable nothing popped open throughout the flight (which was long by the way) or the unpacking process they were really effective; she had so much stuff inside her bag, it was unbelievable how the bag managed to hold so many pieces of clothes inside one traveling bag. When we opened the bags and got the clothes out of them, they were in perfect shape, as if nothing was done to them, nothing was wrinkled and there was even a fur jacket in one of them, it came out perfectly as if it was hanged and covered! I bought them and I was far from disappointment when I tried them. I can now shop without limits or fear of not being able to stuff my clothes inside my bag.