Click on this and read the hints. Within this thread you’ll see a picture and description of that plastic raft I made. You can accomplish the same thing using short pieces of a hollow coffee stirrer. Char Woody used a bent paper clip and or wooden toothpicks. Just to explain what is happening the sealer collapses the bag up front making it think the air is all out, when it is not, but my raft keeps that from happening. Here’s the tread to read.
Also, you might want to watch my video – not so much for the Food Saver application, but watch how I coax the air out – it’s the same principle using the Sinbo snorkel machine.