The product matches the description and calculation of the announced size is correct. This is a FLEXIBLE cover (as shown) ie a neoprene-type material bag. It is therefore not expect sth that will protect your PC against shocks. It's not made for that. The description and the product is exactly what I was looking for, namely a fine bag, small and convenient.
By cons I put 0 for quality and product strength: the shoulder strap seams level began to tear one month after the purchase. If this product is not capable of supporting the weight of a laptop to do everything in the standards (3kg) so it is useless to sell ...