I once got a great piece of advice: “Don’t pack anything you haven’t worn before.” Every time I convince myself to bring that dress I haven’t touched in years, I end up hauling it there and back without ever putting it on. And my favourite: Eucerin’s Aquaphor Soothing Skin Balm (£14.50 for 45ml). I normally use it as a lip balm and on long flights I’ll use it on dry patches of skin.