If your checked luggage exceeds the airline's weight limit (usually 50 lbs or 23 kg for economy), you will be charged an overweight baggage fee, which typically ranges from $30 to $200+ per bag each way. In 2026, most gate agents will offer you the chance to "repack" at the counter: you can move items into your carry-on or into a second checked bag (though a second bag fee will then apply). It is a grounded "pro-tip" to weigh your bag before leaving for the airport; airlines like American or Delta have strict tiers, and once you cross certain thresholds (like 70 lbs or 100 lbs), the bag may be rejected entirely for safety reasons regarding the ground handlers' lifting limits. Investing in a cheap digital luggage scale is the best way to avoid the stress and high cost of "at-the-counter" adjustments.