For a 2-week trip in 2026, most travel experts recommend a medium checked suitcase (23–26 inches) with a capacity of 60 to 80 liters. This size strikes the best balance between having enough space for roughly 10 outfits, extra shoes, and toiletries while remaining manageable for transport. If you are a "minimalist" or have access to laundry facilities, you could theoretically manage with a large 45-liter carry-on, but for a standard vacation involving multiple activities, the medium checked bag is the "sweet spot." For those traveling to cold climates with bulky gear or those who plan to bring back significant souvenirs, a large suitcase (27–30 inches) with 90+ liters may be necessary. A standard "Rule of Thumb" for 2026 is to pack for 7 days and plan to wash your basics once; this prevents you from overpacking and exceeding the common 23 kg (50 lbs) airline weight limit, which can trigger expensive "heavy bag" fees at the check-in counter.