If you are traveling out of town, many moms report that they have successfully frozen numerous breastmilk bags containing the formula and put them on ice and taken them past security check and on-board with them with no problems. Most airlines security check points seem to be very lenient with large quantities of breast milk bags carried on board (as long as you declare it and explain its for each day of your trip, etc). You can also luggage-check your box of formula bags on dry ice. Keep a copy of the recipe inside the box or luggage containing the formula or ingredients in case security inspects it and is curious. Check out Yahoo health groups NewWAPHB for more tips from savvy experienced using the formula.