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arrange
Start by classifying the different types of clothes (dresses, pants, etc.) to have more chance of getting everything back!
As mentioned earlier, place the shoes first at the bottom of your luggage, then the pants. Put over clothing that will wrinkle more easily like shirts and skirts.
Then add your pajamas and toiletries over the suitcase, which is probably what you'll need first.
It is well known, underwear sneaks everywhere, so use them to fill the empty corners.