How can they force you to check when you bring a carry on?” They can, Travel columnist Christopher Elliott said. And they frequently do. “The only way around it is to pack light or to keep all your valuables on your person,” Elliott said.

Yes, an airline can absolutely force you to check your carry-on bag at the gate, even if it meets the size requirements, primarily due to "limited overhead bin space." This is a common occurrence on "full" flights or on smaller regional jets where the bins are too narrow for standard rollaboard suitcases. In 2026, airlines generally prioritize "Group 1" and "Group 2" passengers; by the time "Group 5" boards, the bins are often full, and agents will start "mandatory gate-checking." In this scenario, the airline usually checks the bag for free, though you must still remove your "essential items" like lithium batteries, medication, and passports before handing it over. If your bag is being forced-checked because it is oversized, however, you will likely be charged a "Gate Check Fee" which can range from $65 to $100. To stay grounded and avoid this, a peer tip is to use a soft-sided "duffel" or a backpack as your primary carry-on, as these are much easier to "squish" into small spaces, making agents less likely to target you for a mandatory check compared to someone with a rigid, hard-shell suitcase.