Awesome advice on the icepacks. Old school boxers use ziplock bags. Fill the bag with mostly cold water, add salt and icecubes but don't fill the bag very full maybe about 3/4. The salt melts the ice and lowers the freezing point making the water very cold. The ziplock is really moldable and will form around anything really if not filled up too much. Works great for broken noses and black eyes.

Incidentally ice + salt+ water in a cooler is the fastest way to cool down beer. The notes from a Mythbusters episode here http://kwc.org/mythbusters/2005/03/mythbusters_cooling_a_sixpack.html

To kill two birds with one stone, keep a cooler with icy salt water and fill the ziplocks whenever you need while you're keeping your beer cold! Multitasking!

Eric