I still think about the photographer I watched at a trade show a few years ago. He spent nearly twenty minutes rebuilding his camera bag-peeling out hook-and-loop dividers, threading a lens pouch onto a PALS ladder, clipping a battery case to his hip belt, then changing his mind and moving it to his shoulder strap. The bag looked impressive. The window light outside the convention center didn't care.
I've tested more camera bags than I can count, and I've spent whole afternoons rearranging inserts and clipping on pouches. The more I do it, the more I land on a contrarian take: modularity is mostly a clever engineering detour. It solves an inventory puzzle-how to bolt many things onto one bag-but not the real photographic challenges of staying ready, comfortable, and mentally present. In a lot of cases, a modular camera bag ends up heavier, less weatherproof, less secure, and more mentally draining than a thoughtfully designed fixed bag.
A Quick Trip Through the Kit-of-Parts
Modular camera bags aren't exactly new. Jim Domke's canvas F-2 from the mid-1970s had removable padded partitions so photojournalists could reshape the interior. Billingham and others did something similar. That kind of internal flexibility made sense: you could rearrange your lenses without buying a new bag.
But when most people say "modular" today, they mean the outside: PALS/MOLLE webbing, detachable pouches, swappable straps, clip-on cases. That whole idea came from military load-bearing gear. The U.S. Army adopted MOLLE and PALS systems in the late '90s so soldiers could attach only the pouches they needed for a given mission. Think Tank Photo brought that philosophy to working shooters in the 2000s with belt systems for lens cases, battery pouches, and card wallets. By the mid-2010s, Lowepro's ProTactic series and a wave of crowdfunded bags pushed external modularity into the mainstream.
It's worth remembering where the idea came from. A soldier's modular vest is built around ammunition, medical gear, radios, and hydration-stuff that has to be reachable while wearing body armor, often in a vehicle or under fire. A photographer's bag, by contrast, mostly exists to get equipment from point A to point B. Those two jobs overlap far less than the marketing would have you believe.
The Physics Doesn't Care About Your Pouches
Every PALS ladder, side-release buckle, zippered expansion panel, and clip point adds material and stitching. One strip of sewn nylon webbing doesn't sound heavy, but it accumulates fast.
Here's a rough comparison from my own notes:
- Empty weight: a popular 25L modular backpack came in at 2.36 kg, while a fixed-panel 22L daypack weighed 1.54 kg.
- External zippered openings: 11 on the modular bag, 5 on the fixed bag.
- External attachment points: 24 versus 6.
- Time spent reconfiguring across five shoots: roughly 80 minutes for the modular bag, zero for the fixed one.
That 820 g difference is close to a full-frame 50mm f/1.8 lens plus four spare batteries. Before you've packed a single camera, you're carrying the equivalent of an extra lens.
The ergonomic side is less forgiving. Load-carriage research consistently shows that energy cost and perceived exertion climb when a load sits farther from your spine. A bag that hugs your back feels stable. Hang pouches off the outside-especially on shoulder straps or a hip belt-and every step turns that weight into a small pendulum. A 400 g lens pouch on a front strap isn't just 400 g when you lean over a railing or crouch for a shot. It becomes a lever arm tugging on your neck and lower back. Modular designs encourage you to solve storage by pushing mass outward, which is biomechanically backward for all-day carry.
More Parts, More Ways to Fail
Every zipper is a potential leak. Every buckle is a potential break. Every attachment point is a potential accidental release. Modular camera bags multiply all three.
External pouches need openings that are easy to use, so manufacturers usually rely on ordinary zippers or flaps rather than fully welded or AquaGuard-sealed construction. That's a problem in rain, sand, and dust. A fixed bag can be designed around fewer, better-sealed openings. A modular bag gives you six extra places for weather to slip in.
The connectors themselves are a weak link. Plastic side-release buckles can crack in freezing temperatures, especially after prolonged UV exposure. Fidlock magnetic sliders clog with fine sand. If a lens pouch hangs from a single clip or strap and that clip fails, you don't just lose a pouch-you lose the lens inside it. In a crowd, a detachable pouch is also easier for someone else to unclip than a zippered pocket sewn into the bag body.
I once had a plastic buckle crack on a cold morning while attaching a modular pouch to a backpack. The pouch didn't fall-I caught it-but the failure happened at the exact moment the connection mattered. Multiply that risk across a dozen attachment points and the whole bag becomes a system of small liabilities.
Decision Fatigue Is a Photographic Problem
Photography is already packed with decisions. Light, composition, moment, lens, aperture, shutter speed, ISO, white balance, focus point, framing. Adding bag configuration to that list sounds trivial, but cognitive load is cumulative.
The psychologist Barry Schwartz's research on choice overload found that more options often produce less satisfaction and more anxiety, not better outcomes. A modular bag is choice overload you carry on your back. When you have six empty attachment points, you feel obligated to use them. You start overpacking because the bag can hold more. You spend ten minutes before each shoot deciding whether the battery pouch belongs on the left MOLLE panel or the right hip belt. That's time you're not spending scouting, lighting, or talking with your subject.
The irony is that a fixed bag's constraints can improve your photography. When a bag only holds one body, two lenses, and a few accessories, you make those decisions at home. In the field, you work instead of rearranging. Constraint, not endless configurability, is often the real ally.
A Case Study: One Market, Two Bags
I ran a simple test on a real assignment: the same camera kit in two different bags across several days at a busy outdoor market. The kit included one full-frame body, a 35mm f/1.8, an 85mm f/1.4, a small flash, spare batteries, and a filter case.
With a fully modular 25L bag, I took advantage of the system. I added a water-bottle pouch, a battery pouch on the hip belt, a filter case on the shoulder strap, and a tripod strap on the front. By midday the bag had turned into a bulky, swaying collection of objects. It caught on a market stall. A side pouch unzipped when I squatted low to shoot over a counter. I spent several minutes reattaching things and checking that nothing had fallen. The bag didn't fail catastrophically; it failed through friction-small interruptions that pulled me out of the moment.
On the fixed-bag days, I pre-selected the same kit but left the extra pouches at home. The bag forced me to put batteries in a dedicated zippered pocket, filters in another, and the flash in a padded compartment. There were no choices to make in the field. I moved faster, shot more, and noticed more. The fixed bag was less impressive on a product table, but far more useful on my shoulder.
What Modularity Actually Does Well
None of this means modular systems are pointless. They solve real problems for specific photographers.
- Working photojournalists who rotate among a shoulder bag, belt, and roller case benefit from a mature modular ecosystem like Think Tank's. If you're covering a long event with two bodies and a 70-200mm f/2.8, moving weight to a padded hip belt makes sense.
- Assistants and studio techs who build kits for different clients need compartments that can be reshaped quickly.
- Documentary photographers who work from motorcycles, boats, or climbing gear may need to lash equipment to a rack or harness, and a few well-placed MOLLE loops make that possible.
The most useful modularity isn't the infinite kind. It's the kind that gives you two or three strong, standardized attachment points for a tripod, water bottle, or jacket. The rest is often excess.
A Better Way to Think About Camera Carry
I've started judging camera bags by how quickly they disappear from my attention. A good bag lets me grab a camera without looking, change lenses without unzipping five panels, and forget I'm carrying it until I actually need it. That argues for fewer parts, not more.
If you're considering a modular bag, ask what problem the modularity is really solving. Are you genuinely switching between completely different loadouts from one shoot to the next? Or are you buying the idea of flexibility because you haven't committed to what you need? If it's the latter, buy a smaller, well-built fixed bag instead. You'll carry less, move better, and spend more time looking at the light.
The next generation of camera bags will probably get lighter and more adaptive in smarter ways-laser-cut laminate panels instead of heavy sewn nylon, magnetic hardware that doesn't crack, modularity limited to a few high-stress points. But I suspect the real advance will be anti-modular: bags designed with fewer openings, more integrated protection, and enough constraint to let you forget the bag exists.
A camera bag isn't a storage system. It's an interface between you and your work. The best ones do less, but do it exceptionally well.