This means that when you are packing at home to go away, you can put your clothes in neatly and then vacuum out the air. This reduces (though does not stop completely) creasing as you haven’t had to scrunch the pack up. It also gets the maximum amount of air out of the bag. Then, when you are coming home from your trip and don’t have access to the vacuum cleaner, you can just put the clothes in the bag and roll it (you need to be firm as these are strong bags – just follow the instructions in the booklet on the front of the pack) and as you are on your way home not worry about creasing too much.
The bags are available in two sizes, Large (40cm x 60cm) and Extra Large (50cm x 70cm) and Assorted (3 of each size), but not in the smaller size as they do not roll well in small sizes with a valve.