This is a custom design and therefor does not have a brand name or the exact Liter/Volume indicated on the outside. Looks like a 20 or 22 Liter backpack.
Unique about this pack are the three separate comfort pads against your back, allowing for adequate ventilation to prevent sweating.
Also unique are the lower waist straps with its “wing-like” wrapping with additional easy to reach storage and water bottle holder.
One main compartment and a second one to hold a reservoir. Also an external pocket for jacket or sweatshirts.