Osprey Backpack (Men’s): includes detachable Day Pack; Storage Pockets in waste belt; main compartment has large storage volume; separately accessible storage area in bottom of pack. Lightly used. $150.00. Osprey Water Bladder: fits in its own support pocket inside of Osprey Backpack. Holds 3 litres of water. Water can be accessed through tube to exterior of backpack for drinking. Used one time. Included in price of Osprey Backpack.