Flour was stored in a tupperware container with a tight fitting lid and when opened was alive with weevils any suggestions?

Answer 1

All round Tupperware brand seals are air tight when properly closed (as well as most rectangular TW brand seals....ask your consultant if you're unsure). If the flour was in a properly sealed air tight container for 48 hours or more, then any weevils (or other pests) would end up at the top of the flour, dead (you could then present it with a receipt for return at the grocery store). The fact that they're still alive means there's a defect/crack in the container or it wasn't sealed properly or it isn't an airtight seal.