Ok, so this may sound like more of a hassle than its worth, but it worked for me. I loved the concept of the space bags, but when I went to reuse the cheaper ones, the seal wasn't very good at all. What I did was filled the bag then zipped it shut. I covered the entire zipper area with one large strip of duct tape. I then suctioned out the air with the vacuum and covered the valve with another 2 pieces of duct tape. Worked great for getting a couple more uses out of the cheap ones.