This is probably a fault on all the covers of this brand, unless the strong chemical smell that emerges as soon as the the cover is opened to the liner is clean bright yellow color that characterizes this model. Still, that placed 15 days outside in the inverted position, the smell has decreased but still persists.
So for now not really used much except let closed because the outside does not seem affected by this problem. For the rest, it seems quite functional and friendly. Where the overall score altogether honorable.