Packing for an international carry-on in 2026 requires strict attention to size and weight limits, which are often much tighter than U.S. domestic rules. Most international carriers (like Lufthansa or Air France) limit carry-ons to roughly 55 x 35 x 23 cm and enforce a weight limit between 7kg and 10kg (15-22 lbs). To succeed, start with a lightweight, hardside "spinner" bag that weighs less than 5 lbs empty. Use the "rule of three" for clothing: wear one outfit, pack two others, and choose a neutral color palette so everything is interchangeable. You must strictly follow the 3-1-1 liquids rule, ensuring all gels and pastes are in containers under 100ml and fit inside a single quart-sized bag. In 2026, many airlines have also tightened "personal item" rules, so ensure your backpack or purse can truly fit under the seat in front of you. Always wear your heaviest items—like boots and a winter coat—on the plane to keep them out of the bag's weight count. Finally, keep your electronics and "liquids bag" in an easily accessible outer pocket, as you will likely need to remove them for security screening in international terminals that haven't yet upgraded to the latest "CT" scanners.