Material: Nylon Season: All Season Weight: Approximately 800g Pockets: 4 exterior zippered pockets 2 side pockets 1 interior pocket Thank you for viewing. Used twice for a middle school mountain climbing trip. Includes a backpack cover and a hat stopper. There is no mud on the backpack, but as shown in the image, there is some marker transfer on the name tag pocket on the top. I tried using alcohol, but it didn't come off. The backpack cover has also been corrected after being marked with a marker. Thank you.