If you’re looking for the largest gel pack you can find, the 7×25″ will be a good fit for you. Because of its large size, it works well for a large variety of applications. It is long enough to wrap around a large part of your waist or lower back. It will also ice the length of your back if you suffer from spinal pain. This pack is a favorite among chiropractors and physical therapists because of its versatility.