Packing for 10 days requires a balance between variety and mobility, typically following the "5-4-3-2-1" rule or a variation of it. For a 10-day trip, aim for roughly 5 tops (mix of tees and button-downs), 3-4 bottoms (jeans, shorts, or skirts), and enough underwear and socks for the full duration, though you can cut this in half if you have access to laundry. Include 2 pairs of shoes—one comfortable for walking and one slightly dressier—and 1 lightweight jacket or sweater. The key is layering and color coordination; ensure every top matches at least two of your bottoms to maximize outfit combinations without overpacking. If you use packing cubes, you can easily compress these items into a carry-on. Remember to wear your bulkiest items (like heavy boots or a coat) on the plane to save space in your luggage. Overpacking often leads to stress, so focus on versatile fabrics like merino wool that resist odors.