Standard luggage sizes are categorized into three main groups based on airline regulations and trip duration. Carry-on bags are the most strictly regulated, with a global standard of approximately 22 x 14 x 9 inches (56 x 36 x 23 cm). This size is designed to fit in the overhead bins of most major aircraft, though budget carriers like Ryanair or Spirit may require smaller "Personal Items" (approx. 18 x 14 x 8 inches) that fit under the seat. Medium Checked bags typically measure around 24 to 26 inches in height and are ideal for 7-to-10 day trips. Large Checked bags usually measure 28 to 32 inches in height. Most international airlines enforce a "Linear Inch" limit for checked bags, which is the sum of the length, width, and height; the standard limit is 62 linear inches (158 cm). Exceeding this total can result in "Oversize" fees that range from $75 to $200. In 2026, many travelers are opting for "expandable" hardside luggage, but it is a "pro-tip" to remember that expanding a 28-inch bag often pushes it over the 62-inch limit, making it a target for additional fees at the check-in counter.