Innovation for more freshness: ZWILLING FRESH & SAVE BOWLS. The two bowls of the unique vacuum system are ideal for preparing, baking, serving and storing a wide variety of dishes. They are also ideal for meal prep: the vacuum lids allow food to be quickly vacuum-sealed and stored in the fridge or freezer, keeping it fresh up to five times longer*. It's very easy: simply place the vacuum pump on the valve, press the button and you're done. The lids offer additional flexibility: they also fit on the STAUB CERAMIQUE bowls (without handles). For maximum freshness, the vacuum bags are ideal for freezing, sous-vide cooking or marinating your food *compared to conventional storage without vacuum.