Vintage Tupperware may be worth a lot more than you think
Open a Vacuum Sealed Container : 4 Steps (with Pictures) - Instructables
Vintage TUPPERWARE Plastic Containers w Lid & Wall Hanging Mount ---- Open Box! | eBay
How to open this vacuum sealed Tupperware jar. I microwaved it with the lid on, the food got super hot, and created an incredibly tight seal that I can't pull open. :
Open a Vacuum Sealed Container : 4 Steps (with Pictures) - Instructables
Open a Vacuum Sealed Container : 4 Steps (with Pictures) - Instructables