For most savvy travelers in 2026, carry-on luggage is absolutely enough for a 2-week trip, provided you utilize a "capsule wardrobe" strategy and strategic packing tools. The key is to pack for about 5 to 7 days and plan for a "laundry day" mid-trip, either at a local laundromat or through a hotel service. Using compression packing cubes can save up to 30% of space, allowing you to fit more items into a standard 22-inch suitcase. Choosing lightweight, multi-purpose clothing (like Merino wool) that resists odors and dries quickly is also essential. By wearing your bulkiest items—like a heavy jacket and hiking boots—on the plane, you free up significant space in your bag for essentials. This "minimalist" approach not only saves you from checked-bag fees (which have risen to an average of $40–$60 per bag in 2026) but also eliminates the risk of lost luggage and allows for much faster transitions through airports and train stations, making it the preferred method for modern international adventurers.