1. Wet swim-suits
    They're even harder to pack if you don't have plastic bags to put them in.
  2. Dirty clothes
    Try and separate the clean and dirty clothes in one suitcase. Let me know how that goes.
  3. Boots
    I never know the right way they should face.
  4. Dry-clean only items
    But do you pack the hanger and bag they came in, too?
  5. Pants
    When in doubt, shove them in the boots.
  6. Souvenirs
    You always forget to pack them, always.