Packing for a Cross Country Trip

I've already cited Onebag.com as an excellent resource for packing advice. But what about a camping trip across country, one that includes children and cooking and hiking, and extremes of temperature? Well, for that I found the Universal Packing List site to be invaluable. It has drop down menus for you to choose the length of your trip, the temperature ranges, and activities. For me, having a packing list frees up much of my mental energy for the fun of making choices about which shirt to bring rather than agonizing about forgetting a crucial item. I can also hand one to my children and have them do their own packing.