The Back Sac is a unique back support cushion, designed by a physical therapist to better support your spine in any resting position. It has been successful in relieving back and neck pain related to back injury, spinal arthritis, disc injuries, scoliosis and pregnancy! The Back Sacs unique design uses air to provide the perfect lumbar support whether you are sitting on your couch, at your desk, or in your car! The air travels through the Back Sac when you move, following your spinal curves, creating a dynamic support that no other back cushion can replicate! The Back Sac creates the perfect pillow to support your neck while traveling in a car or an airplane. It can be used to support your knees when sleeping, or your lumbar curve when performing abdominal exercises. Your school aged kids can recline against it while reading or watching TV. Because of its ability to adjust to fit all body shapes and sizes, the Back Sac can be used by anyone to improve posture and comfort!