You have changed your bags! On the cheap no doubt to save money you have made them thinner, the result is they will not allow the FoodSaver to suck out the air. If I fold down the edge of the bag the air sucks out (however poorly). If I use Ziplock brand they work great. I just bought a box of your bags to the tune of $29/bucks and have $174/bucks worth of fresh tuna that I can't get vaccuum sealed properly. I'm really not amused!!!!!