The TACMEDTM IV Evaporative Cooling System was developed to help maintain safe temperatures for medical fluids (such as saline) in the excessive heat of desert environments such as Iraq and Afghanistan. Using only passive evaporative cooling, the ICECS reduces heat and keeps temperatures cooler longer. Each of these Carriers is designed to hold a 500ml or 1000ml IV bag, but this is also the approx. size of a wine bottle or larger beer can/bottle. Dip the ICECS into water for 15 minutes, then let it help keep your favorite drink cool for up to 18 hours.