The mark of a good invention is that it delivers benefits to the broader community as well as a specific audience. "The Keeper", a small, internally worn reusable menstrual cup does just that - providing women with a comfortable, inexpensive alternative to tampons and pads and alleviating the environmental impact of the more than 12 billion sanitary products that are used once and then disposed of throughout the world each year.It is estimated that with proper care the average woman will need approximately four Keepers throughout her menstruating lifespan. On the other hand, she would need to purchase nearly 12,000 disposable tampons and pads during that same time period. The Keeper' is made from the same soft, natural gum rubber used to make baby bottle nipples and according to Ms. Lou Crawford, president of the company, the menstrual cup is simple and comfortable to wear and when cared for properly, one Keeper has a life expectancy of at least 10 years.The Keeper is available in two sizes from at a cost of AUD$64.