These containers are fine as long as you keep them in the fridge of freezer. But don't try to move them out of the house. The silicone on the lids is very soft and the protruding part of the silicone is very easy to lift up if it catches on something like the wall of the bag you are carrying it in. The result? Air goes in and if you have any liquid in there will spill into your bag. Don't buy them if you intend to move them.