REI Nalgene Hydration Backpack full sized. Front zippered pocket with two mesh open compa inside it. Behind it Isabel inverted U shaped over the top zippersr to reveal the center of the backpack. Zippersred externall pockets on each sider. Very nicely padded shoulder straps. 19x14x6. This backpackk has no rips or tears and is in veryy goods pre-lived condition.