It is true, I had a list when I packed for my trip to San Francisco and while I overpacked I still had the list which today is really helpful.
If you are traveling this summer / winter you need to make a list too
Here are a few lists that will help you be a better traveler period.
From Eagle Creek whether its 48 hours or 196 hours they have the equipment and gear for your trip.
Local Jessica Doll has traveled and traveled some more her lists are bible worthy.
Smarter Travel is just that smart and while I applaud their assumption that everyone makes a list here is their Ultimate Packing List for you to use.
You can not escape Rick Steves or Samantha Brown when you say the word Travel so you might as well emulate them with a list.