"Necessity is the mother of invention" is the saying. However may I add to that observation my own;" the child of invention is persistence despite all evidence to the contrary". These two truths represent the essence of our product, the Multi-purpose Uniaxial Litter Enginery or MULE. On a vacation to Salem Oregon some years ago I was invited to hike along the coast of the nearby Pacific Ocean. Being born and raised on the west and south sides of Chicago, Illinois, hiking wasn't exactly a recreational option for me coming up. One of the hikers in our group lamented his increasing inability to enjoy hiking anymore. For him, it had become more and more difficult to backpack needed gear in the field. "Don't they have something that helps a person with backpacking loads in the field? No, not really. "After all, aren't there many people that enjoy hiking, there must be something?" No and we've all looked. Hmmm... On my flight back home to Tennessee, I began brainstorming what would become the MULE. Necessity was indeed the mother. Since then many thousands of hours of designing, testing and developing have gone into the MULE. With the issuance of United States patent # 4,664,395 came the solo MULE expeditions such as the 3000 mile coast-to-coast walk from Newport Beach, California to Cape Henlopen, Delaware, the Death Valley summer expedition and other shorter field expeditions-all done without motorized vehicle support. Thus came invention's child, persistence. The continuing strive to improve the product, often at risk of injury or worse is always pursued with childlike persistence. We at IDI believe that in the MULE, we have improved a centuries old basic human endeavor that has essentially remained unchanged. Increasing a man or woman's load bearing ability in the field by 100% both in weight and volume by use of our simple, reliable and effective product is, we believe, of benefit to humankind worldwide. Welcome to the revolution.