Regular ice melts fast and can leave the cooler contents floating in a puddle and some items such as sandwiches a soggy mess. It is not the ideal ice to use in a cooler on long outdoor excursions such as camping or for shipping perishable products. It is also not cost effective for everyday use such as for keeping lunches cool and fresh, as it is not reusable. You have to purchase regular ice each and every time you need it.