Do not copy a kilogram number from a friend’s ticket or from an old PNR. The same airline sells different bags on different fare families and routes. During search, each fare row shows the baggage text the airline filed (piece concept or weight concept). That text is what you should plan around. Extra bags, sports equipment, and pets are special requests — ask before ticketing. Cabin liquids, battery, and sharp-object rules belong to aviation security, not to the agency. If a page on this site and the airline’s SMS after ticketing disagree, the airline ticket is the contract.