Packing for 10 days in a single carry-on requires a strategy centered on versatility and compression. The most effective method is the "5-4-3-2-1 rule": pack 5 tops, 4 bottoms, 3 pairs of shoes (including the ones you wear), 2 swimsuits or jackets, and 1 of each miscellaneous accessory (like a hat or belt). Stick to a neutral color palette so every item can be mixed and matched to create over 10 different outfits. Use compression packing cubes to squeeze the air out of your clothes, which can save up to 30% more space compared to traditional folding. Another essential tip is the "Bundle Wrap" or "Rolling" method to prevent wrinkles and utilize every square inch of the bag. Wear your bulkiest items—like your heaviest jacket and boots—on the plane to keep them out of the suitcase. Finally, plan to do one small load of laundry halfway through the trip or use travel-sized detergent to wash essentials in the sink, allowing you to pack for 5 days but live for 10.