Bag inflating

[Ron Pratt]

My guess is you do have a small hole at the sealed seam or if you have handled it there may be a minute hole somewhere.

What you can do is try to locate the leak by pressing your hands press the bag against the meat thus forcing out as much air and not leaving any air pockets. Then at the leak site insert a drinking straw or a piece of tubing in and then grab the bag tightly around the straw or tubing and finish sucking out as much air as you can. When done quickly remove the straw or tubing and tightly close the end using a bread twisty or packing tape.
Ron