Lids sometimes do not seal

At first I loved these lids. I used the smallest lid and it sealed really well! The medium lid seals sometimes but the medium lid wiil curve on the outside and therefore you don't always get a great seal. I washed all of lids by hand before using and laid them out flat to dry. The largest lid dried with high curves all along the outside rim. I tried to weigh it down to flatten and it would not lay flat. I tried immerging in water and then tried to seal to pot and would not seal because of the curves.

Works Well

Was a bit worried, but these work great. Bought a set for me and a set for my daughter.

I like the product.

The product works through suction. However, I tried one of the lids on a plastic bowl with a crack on the rim. But, the lid couldn't form a seal, so it didn't work in this case. (Kind of obvious i guess). I tried another one of the lids on a glass bowl that I kept in the fridge. When I took the bowl out of the fridge, condensation started to form. This created a slippery surface, which prevented a seal from forming. The lid didn't in this case either. I tried one of the lids on a dry glass bowl, and the small lid on a dry ceramic bowl. A seal was formed in both cases. I could also pick each bowl up by the tab on the lid. I was impressed.

Amazed at the automatic suction. Held tight on glass bowls.

Akmazed at the suction. Great sizes.