These larger floor model chamber vacuum machines are the work horses of the food packaging industry! They are simply a stainless steel box (chamber) with a seal bar(s) to seal the pouch. The air is pulled from the entire chamber during the vacuum process, the bag is sealed and then the air is let back in the chamber. Most chamber machines can be set up to gas flush which is inserting an inert gas back into the pouch after the air is taken out. Because the entire pouch is in a vacuum, chamber machines use standard "flat" commercial vacuum pouches. All our vacuum pouches with the exception of the embossed pouches will work with the chamber machines. Because the pouch doesn't get tight until after the pouch is sealed, chamber vacuum machines work great for vacuuming liquid and/or product that has a lot of liquid in it. Most of the Minipack MVS series of machines have a slanted liquid tray kit available to help you package liquids.