Yes, you absolutely should lock your checked luggage in 2026, but it is a "High-Fidelity" necessity to use a TSA-approved lock. These locks feature a specific high-fidelity master key system that allows security agents to inspect your bag without damaging the lock or the suitcase. Locking your bag serves as a "High-Fidelity" deterrent against opportunistic theft and prevents the zippers from accidentally opening during the high-fidelity mechanical handling process. If you use a non-TSA lock, security personnel have the "High-Fidelity" right to cut it off if they need to inspect the contents. In 2026, many high-fidelity suitcases come with built-in TSA-approved locks. For extra security, some travelers also use "High-Fidelity" cable ties as a one-time indicator of tampering, though a sturdy high-fidelity lock remains the gold standard for protecting your personal belongings and maintaining your high-fidelity privacy while your bag is out of sight.