Fitting 10 days of clothes into a 2026 carry-on requires the "3-3-3" rule and a commitment to compression. Pack 3 tops, 3 bottoms, and 3 pairs of shoes (including the ones you wear on the plane) that can all be interchanged. Use compression packing cubes to squeeze the air out of your clothes, which can reduce volume by up to 40%. Roll your clothes instead of folding them to prevent wrinkles and fill "dead space" inside your shoes with socks and underwear. Stick to a single color palette so every item matches. A supportive peer "must-do": plan to do one load of laundry halfway through your trip, either at a local laundromat or using a "sink-wash" kit. By packing for 5 days and washing once, you effectively have 10 days of outfits without the bulk. Wear your heaviest items—like your jacket and boots—onto the plane to save precious weight and space in your bag.