The Luggage Trap is a free, visual calculator designed to help travelers avoid expensive airport gate fees. Users simply select their airline (including Delta, Ryanair, Southwest, Frontier, and more) and input their bag's length, width, and height. The tool instantly calculates the linear dimensions and checks them against the airline's strict 2026 policies to give a simple PASS/FAIL result, along with expected penalty fees and guaranteed-safe luggage recommendations.