Therapacks back and stomach heat packs are manufactured in Australia. They contain 100% natural lupin seeds to avoid mould growth and weevils. You can microwave or freeze these packs. These are the only packs we use in our clinic and they’ve lasted us 10 years of constant repetitive use. The segmented sections enable the seeds to stay in place without slipping and moving all to the end of the bag. The large rectangular shape is perfect for lower back pain, as well as abdominal pain from period pain, labour pain or indigestion.