For a one-week vacation, the "best" suitcase size is typically a medium-sized checked bag, which measures between 23 to 26 inches (60-67 cm) in height. This size strikes a perfect balance, offering a capacity of 60 to 80 liters, which is enough space for roughly 7 to 10 outfits, two pairs of shoes, and a full-sized toiletry kit without becoming overwhelmingly heavy or bulky to maneuver. While a minimalist "light packer" can certainly survive a week with a large 22-inch (56 cm) carry-on, this often requires doing laundry mid-trip or sacrificing variety in footwear and evening wear. If you plan on bringing back souvenirs or are traveling to a colder climate that requires bulky layers, the medium checked bag provides the necessary "wiggle room." Most travelers find that this size is the "sweet spot" for 5-to-10 day trips, as it is large enough to be practical but still fits easily into the trunk of a standard taxi or rideshare vehicle once you reach your destination.