My simpleHuman bin came with code G (sure fit) liners. This product is specified as code G but described as (custom fit) and my bin is featured on the product packaging.
When ordering I thought that sure-fit and custom-fit was only a regional difference in naming.
However, I find that these liners don't fit as snuggly as the sure-fits, and are slightly loose. So, what happens is that once the inner bin is dropped in, the liner is often disturbed and then requires me to tuck it in with my fingers.
A little fiddly but worth the low price here on Amazon.