Whether a small suitcase is classified as "hand luggage" depends entirely on its physical dimensions and the specific "sizer" rules of your airline. Most major international airlines (like Delta, BA, or Lufthansa) define hand luggage as a bag that is roughly 55 x 35 x 22 cm (22 x 14 x 9 inches). If your suitcase exceeds these measurements even by an inch, it must be checked into the cargo hold. In 2026, "ultra-low-cost" carriers like Ryanair, Spirit, or Frontier have become even stricter; their "free" hand luggage allowance is often restricted to a "personal item" (backpack or purse) that must fit under the seat, meaning any suitcase—no matter how small—requires a paid upgrade to go in the overhead bin. A peer-to-peer tip for 2026 is to always check the "linear dimensions" (length + width + depth) of your bag. If the total exceeds 115 cm, you are almost guaranteed to be asked to check it. Always look for a "cabin-approved" label when buying a new suitcase, but verify it against your specific airline's app before heading to the airport.