Very versatile, you can use the 1,5L cruix reservoir or 2x 500ml or all at once. Light, easy to clean, pockets for documents, side pockets and a big pocket behind the reservoir.
Light, durable, stays put close to body. Does well on bike, run, trail, ocr. Pockets for extra bottles, fuel, phone. Cleans easy even after lots of mud. Survived 3 spartan races.