My wife loves the "space bags" that you use the vac. cleaner to suck the air out of a one way valve. I will say that the volume for bulky items is greatly reduced, depending on the item. I have noticed a couple of times that air will leak back in, but we have some that are still tight after a year. I think it is an issue with getting a proper seal on the zip-seal at the mouth of the bag. Your mileage may vary, but worth a try if you can find a good deal on the bags.