I used to be that photographer who bought a bag with a built-in combination lock, threaded a tiny padlock through the zipper pulls, and felt incredibly smart walking through crowded train stations. Then I watched a thief open my "secure" bag with a ballpoint pen in under four seconds. That moment sent me down a rabbit hole of materials science, lock-picking forums, and conversations with former pickpockets. What I found completely changed how I travel with my gear.
The short version is this: locking zippers are mostly a placebo. In some cases, they actually make your gear less secure. Here's why, and what I do instead.
Why a locked zipper is easily defeated
Let's start with the physics. A zipper is not a lock-it's a chain of interlocking teeth held together by a slider. When you secure the slider with a padlock, you prevent it from moving along the track. That sounds good, but a thief doesn't need to move the slider. They just need to separate the teeth.
This is called "pen jamming." A pen (or a key, or a screwdriver) is inserted into the zipper track a few inches away from the locked slider. With a quick pull, the tool wedges between the teeth and pops them apart. The zipper opens silently, and the lock is completely bypassed. I tested this on a dozen popular camera bags-Lowepro, Peak Design, Think Tank, Manfrotto-and every single one opened this way. The strongest resisted about 15 pounds of force, which is nothing for an adult in a hurry.
The lock itself is irrelevant. It only stops the slider from moving; it doesn't stop the zipper from breaking.
The psychology of theft: locks attract thieves
Here's where a little criminal psychology flips the script. I interviewed a former pickpocket in Barcelona (he's since written a book about theft prevention) and asked what draws his attention. His answer was immediate: "Anything that looks protected."
A bag with a visible padlock or a prominent locking mechanism signals one thing: there's something valuable inside. Why else would someone lock a bag? A thief scanning a crowd looks for exactly that signal. An old, worn canvas bag with a flap-over closure? That gets ignored. A clean black camera backpack with a shiny combination lock? That's a target.
Police theft data from major tourist cities backs this up. The most common thefts happen not when bags are locked, but when they're inconveniently placed-on the back of a chair, under a table, or hanging off the back of a stroller. The lock doesn't matter; the opportunity does. And a visible lock actually increases opportunity because it creates a perception of value.
The hidden downsides of locking mechanics
I've also discovered that locking zipper mechanisms can introduce physical weaknesses. Many camera bags use a two-slider zipper where the sliders meet in the middle and a small loop holds them together. That loop is often made of thin metal or plastic, and it's attached to the zipper slider with a tiny rivet. Under regular use-especially when you're stuffing the bag into overhead bins or tossing it into a car trunk-that rivet can bend or break. I've personally had two bags where the locking tab snapped off, leaving the zipper permanently stuck halfway. A standard zipper would never have failed that way.
There's also the human factor. Locking and unlocking a zipper is a hassle. You fumble with a number combination or dig out a tiny key. That friction leads to shortcuts: leaving the bag unlocked "just for a minute" while you grab a shot, or not bothering to lock it at all after the first few days of a trip. The feature that was supposed to protect your gear ends up unused, while the thief is still out there with a pen.
What actually keeps your camera safe
After all this testing and research, I've settled on a handful of strategies that work better than any lock. They're not as sexy, but they're backed by both engineering and real-world experience.
- Zippers against your body. The most effective "lock" is your own torso. Wear your backpack on your chest in crowds (yes, it looks dorky, but it works). Or choose a bag where the main compartment zipper runs along the back panel, inaccessible when worn. This physically blocks the zipper track from a would-be thief.
- One-way zipper pulls. Some bags, like those from Pacsafe, use a zipper pull that only moves in one direction unless you press a small release. These are much harder to pen-jam because the teeth are under constant tension. It's not foolproof, but it raises the effort required.
- Cut-resistant fabric. A slash-proof bag embeds a stainless steel mesh into the fabric. A thief can't cut through it with a box cutter, which is a common technique for snatching gear from a bag slung over a chair. This is a real, physical barrier-unlike a zipper lock.
- The carabiner trick. Instead of a padlock, I use a small locking carabiner (like a mini screwgate for climbing) to clip the zipper pulls together. It looks like an accessory, not a security device. It's quick to open with one hand. And it doesn't scream "valuables inside." This is the closest I've found to a practical middle ground.
- Situational awareness. This is the unglamorous truth that every theft prevention expert I've spoken to emphasizes: no piece of gear replaces paying attention. Keep your bag in your line of sight. Don't hang it on the back of a cafe chair. In transit, keep it between your feet or on your lap. Thieves are opportunists-they look for inattention, not locked zippers.
A final word on what to buy
I'm not saying you should avoid bags with locking zippers entirely. If a bag fits your needs, comfort, and budget, and it happens to have a lock, that's fine. But don't let it be a deciding factor. Don't pay extra for it. And don't think it somehow makes your gear safe.
The photography industry sells a lot of fear along with the gear. The best way to protect your camera isn't with a tiny padlock-it's with smart habits, nondescript bags, and the simple act of keeping your hands on your bag in crowds. That saved me more photos than any lock ever could.