A backpack assembly that includes a backpack adapted to carry sports equipment with a foldable seat and roller segment secured thereto. The backpack has an internal bag frame to support the sports equipment. The backpack also has a sports-ball-securing segment and an insulated pouch for food and beverages. The foldable seat is secured to the bag frame to provide a seat that can fold out for the participant or spectator to sit upon. The roller segment automatically engages such that the bag can be tipped and rolled by the participant or spectator when the foldable seat is stored. When the foldable seat is deployed, the roller segment automatically disengages to provide a stable platform for the seat.