Most domestic airlines publish checked baggage size limits as a single dimension: 62 linear inches total. International airlines vary slightly, but the 62-inch rule is the most common standard worldwide. Bags larger than 62 linear inches can still fly, but they may be subject to additional fees.

In the world of commercial aviation, the "biggest" suitcase is usually defined by linear inches (length + width + height) rather than just a single dimension. For standard checked baggage on most major airlines (like Delta, United, or American), the maximum size allowed without paying "oversized" fees is 62 linear inches (158 cm). In terms of physical height, this usually translates to a 32-inch suitcase. While you can find massive "trunk-style" suitcases that are 34 or 36 inches tall, these almost always exceed the 62-linear-inch limit and will result in heavy surcharges—often $200 or more per flight. Furthermore, many airlines have an absolute cutoff at 115 to 120 linear inches, beyond which the bag simply won't be accepted as luggage and must be sent via a cargo service. When shopping for the largest possible legal bag, a "30-inch" or "32-inch" upright is typically the safest bet to maximize your packing space while staying within the standard 50-lb (23-kg) weight limit and size restrictions.