These are sturdy well-made containers that seal tightly. There is a rubber gasket in each lid that gives confidence that they will not leak. The plastic is thick and transparent. Dishwasher and microwave safe. They range in size from about 11 cups (2.5 liters) down to 1 cup. We'll have to see how long the plastic hinges on the 4 lockdown tabs will last. But so far I quite like them.