I have a Food Saver, too. Not sure of the model, but the top opens on a hinge so you can lay the edge of the bag on it and then close the top to seal and suck out all the air. It also has a hose to suck out air, but I've never used that.
I also bought bags off of Amazon and they are working great and are a lot cheaper, plus they come in 3 different sizes, per box.
I never thought of freezing liquids before I vacuum packed them, I just figured you couldn't do it. Thanks for the tip!
My husband uses it a lot for camping food because he can vacuum pack things to make them small and then cook stuff right in the bag in a pot of water.
Watson