An updated backpack review after 4- 1/2 years of use.
Specs:

Size: 40.5cm (H) x 30.5cm(L) x 14cm(W)

Volume: 17L - Expanded Volume: 31L

Weight: 1.1KG

Pockets: 2 external (2 in 1 style, 1 sleeve pocket) 1 internal pocket with zipper

Closure: large flap over main compartment

Water Resistant