I have a hefty ASUS 72Q notebook, 41 x 30 x 4.2 cm, so was anxious to ensure my purchase was suitable. Amazon only quoted the (presumable) external dimensions of the sleeve: 45 x 35 x 8 cm.
So I spent some time looking at customer reviews and noting the machines which the reviewers said fitted OK and then looking up those sizes. (You can tell I've retired.)
It seemed that it ought to be OK, so I've now bought it. Well, the ASUS can be squeezed in, but it's tighter (the long dimension) than I would like, so I hope the zip holds out.
My gripe is that Belkin clearly state on the packaging: Notebook compartment 33 x 41.7 x 3.2 cm - why don't Amamzon put this on their site?
Quality looks excellent & standard delivery came well within 48 hours, so 5 stars there.