Top tube storage cover dimensions?

Can anyone tell me what the dimensions are for the top tube storage cover? (I assume they are all similar but I am looking at it for the Endurace CF SLX 8 Di2 Aero specifically.)

Follow up, is the cover's latch strong enough to hold a top tube bag in place if I drilled mounting holes in the cover and bolted it on. Bolt on is just a better look compare to the straps in my opinion.

Thanks