As for packing; I also recommend a Swiss Army Knife (either Wenger or Victorinox brand), they have so many uses but you will have to remember to pack it in your checked luggage when you fly to avoid it being confiscated by security.
Packing light is essential. Just one pair of shoes and lightweight versatile clothes. You don't need ten changes of clothes (three or four is usually enough), although a round-the-world trip usually means that you have to be prepared for all types of weather.
If you save enough weight you could probably treat yourself and bring along a hair straightener, although you'll either need to get a dual voltage one or bring along a relatively heavy (about 600g) transformer so you can use it in North America (where the voltage is only 110v). Alternatively you can forget about the transformer and not use the hair straightener when you're in North America.
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