In the picture it looks like the shell would be closed at the bottom. But it is open on both sides.
Thus, the shell can also fine-tune something. Just the bottom 1cm air can (then the envelope not too dirty)
Then it's okay.
Is basically a gimmick rather also for the eye.
But the Weber grill which also other accessories of Weber is purchased directly accessed here.
One must not discuss sense or nonsense of Grill accessories from Weber. Much useful. Many also simply a must have.
Is simply a must.