When there are easy to open bags, in all likelihood they will choose those over ones with locks. Even if you aren't worried about thieves, locks keep your bags zipped so nothing falls out on accident. While hard luggage is unlikely to unzip, it's very easy for backpacks to open on their own after being thrown around.

In 2026, TSA-approved locks remain a vital component of travel security, primarily because they allow Transportation Security Administration agents to inspect your luggage without damaging the lock or the bag itself. These locks feature a master key system that only authorized security personnel can access. If you use a non-TSA lock and your bag is flagged for a manual search, agents are legally permitted to cut the lock, often ruining the zippers or the suitcase in the process. Beyond avoiding damage, TSA locks act as a deterrent against "opportunistic" theft during transit, preventing quick hands from unzipping your bag in a crowded terminal or baggage hold. Many modern TSA locks also include a "red indicator" that pops up if an agent has opened your bag, giving you immediate peace of mind or a prompt to check your belongings. While they won't stop a determined thief with a pair of bolt cutters, they are the industry standard for ensuring that your luggage remains secure while complying with international safety protocols.