Question about Mammut Lithium 20

This backpack is clearly not designed to hold a laptop on a regular basis. The "laptop" compartment is 24cm wide at the top and 20cm at the bottom (the pack has a tapered shape) with no protective padding. The main compartment should fit a big laptop but it may not sit all the way at the bottom.

This is an outdoor bike and hiking rucksack!!! It's perfect for that. The compartment on the back is never a laptop compartment but for drinking bags. A 13 inch laptop with a thick protective cover fits into the main compartment and is sufficient for occasional transport - in the long term I would switch to a product that is made for this - e.g. business or travel backpacks.

I got the bag now anyway and yes, it fits, with almost no space to spare (in height and width)
But it doesn’t fit in what might look like a “laptop compartment”.
Also there is zero padding / protection at the corners, so I will keep using a thin laptop sleeve.

What are the external dimensions?