We have had the bin for several weeks now and used only 20 litre brabantia bags - these are too slim to fit properly across the top of the bin - we have been unable to find wider ones for 20 litres. We thought on day one that this factor prevented proper closure but we are now convinced that whatever bag we use the lid always remains half an inch open. We now use a lightish weight to keep it closed. This is NOT what we expect from BRABANTIA.