What is the easiest way to pack for a 3 week trip?

If you have an idea of the weather at your destination, it's helpful. But try to be prepared for variables in temperature and sun/rain. Get out a few things that you know you will need such as sunglasses, raincoat, etc. Get your toiletries together. If you have last minute things you will need to add right before leaving, keep a list out so you won't forget anything important. Lay out several days worth of 'outfits', things you would normally wear together. Don't forget shoes and socks. I like to wear the biggest things, like boots, coat, jeans, etc. when traveling so I have more room in my suitcase. I also like to roll my clothing because I can get more in the suitcase that way. I like to add at least one nice outfit for a dinner out and casual 'around-the-house' stuff too. I try to take clothes that can be worn more than once. Sometimes that's a necessity when you are away so long. As long as you have access to a washer/dryer you should not have too much to take. I have found I do a better job of packing at the last minute than when I prepare way ahead-- not sure why, but hey, it works for me. Good Luck! :)