I always start out thinking I'll pack only what I need or will use. Then my brain decides it needs to imagine every possible situation we could encounter along the way and pack everything that I would need in that situation. This usually creates a suitcase full of items that are dearly loved but unnecessary at the present moment. If I could pack my entire room into a magic bag like Hermione's I would have no problems at all. Alas, my life is not a novel, and magic isn't one of my extra fine abilities.
The little voice in the back of my mind will often show itself when I'm packing and make suggestions that seem very respectable, at the time. Then I have to remind myself that we are going south and no matter how likely I believe a snow storm is, I do not need to bring a parka.
Good thing the sensible side of my mind knows when to show up.
Wish me luck! this is t-bear signing off