We have used that type of bag for a couple of years.
Far better than zip locks,,because you can get much more air out. It has a one way valvce to let air out,,not in.
They are best for things that dont winkle much
We use a large bag just for laundry. We marked the bag,,,laundry, so we don't use it for clean clothes. GReatly reduces the amount of space needed for laundry,,,and who cares if it gets wrinkled.
Bought ours at the Container STore. Don't get them too cheap or they me too thin and rip. I saw a demo on the Today SHow and a finger went right through the bag.