Vertis Introduces Lunch Bag With Quad Lock Pp Lid For The Exclusive You-The Healthy Connoisseur. Ideally Designed For Saving Space, The Light Weight Jars Are Stackable And The 4 Side Locking Along With The Airtight Silicone Ensure That Your Food/Cereals Remain Fresh For A Long Time; Versatile Functionality Goes Hand In Hand With The Unmatched Elegant Looks. You Can Also Heat/Cook Small Quantities In The Gas Stove. Made From 3.3 Borosilicate Glass, It Can Withstand A Temperature Of 500 Deg C Making It The Best In Class For Microwave And Conventional Oven Operations.