Sitting at a desk all day long can seriously affect posture and lead to chronic back pain. If you don't have an ergonomic chair available, you can easily transform a regular office chair into one by strapping a back cushion onto it. You can opt for a lumbar support pillow made of precision-cut foam, a polyester-filled neck support pillow that can double as lumbar support, or a variety of inflatable back support cushions that you can easily adjust and deflate for portability, such as the Medic Air Back Pillow.