The Osprey ROCK 50 was made for adventures. Its simple and modern design provides maximum comfort and excellent fit on the back. It is easily adjustable, with a special ventilating back system. It is also compatible with Osprey Daylite backpacks, so you can attach a smaller backpack to the bigger one in order to increase the capacity. This also comes in handy for shorter trips where you can leave the Rook at the campsite and just take a small backpack with you.