Sniffing and squeezing to find the best produce is just the beginning. Don't let it go to waste in the fridge before you even have a chance to enjoy it. These patented containers double to triple the life of your produce by controlling airflow and moisture. Simply set EZ slider seal vent to match produce chart. Built in grid helps protect contents from moisture, and the containers nest together when not in use. Modular sizes stack together to save space. Tupperware is 100% BPA Free, and safe for your family.