Dry ice is a great way to keep food cold, but it isn't without some safety concerns. Before you pack a cooler with dry ice, here's how to do it safely.

Dry ice is only useful when it's still frozen, so make sure you know how much time you have before it evaporates. Luckily, ...

Fifty pounds of dry ice should hold an 18-cubic-foot freezer for two days, possibly more. Take care when handling dry ice; don't handle it with bare hands or place it directly on foods.