Nowhere on the internet could I find the dimensions of the backpack, let alone the external pockets or the size of the bladder it could accommodate. Without any experience with similar bags and bladders, I proceeded with the purchase blindly. I also ordered the Osprey 3L bladder without knowing if it would fit.

In short, the bladder fits somewhat tightly when full, the bag is 10 liters and still has plenty of room for various cycling accessories. It has a nice anti-private system. The rest can be seen from the photos on the internet.