Very nice design. The backpack is durable, quite lightweight, and indeed waterproof. The absence of an external pocket makes the backpack impractical. The back pocket is extremely small. As for the interior, you need to dig to find keys, wallet, or something of similar size. If I don't place a water bottle, there is no space left for many things. The external hook is a negative aspect of the backpack. It is impossible to open the backpack with one hand.

I bought the backpack at a discounted price - they probably didn't prefer this particular color. At the original price, I wouldn't buy it for anything, given my experience.

Waterproof indeed.
Good construction quality.
The compartments are few. I would like at least a few more pockets inside, but okay, you get a small toiletry bag.
The 15.4-inch laptop fits perfectly, suitable for everyday work use.
Perhaps the handles are not convenient for some, but I expected worse. You can easily carry it all day.
It was very useful for the trip I took it on.