ThomD
>Sure that's a better system than what you can buy for 50 bucks. See the difference? On the other hand how is yours at doing a 50 foot panel? Some of the smaller pumps don't have the volume to even extract the bag.

Another thing is that ir depends on a perfect seal within an all enclosing bag. That means the molds have to be able to bear up to full weight of the atmosphere which is pretty wasteful.