There are two camera bags sitting on my studio floor right now. One is a modern 20-liter messenger with eleven padded dividers, four zippered pockets, and a main compartment that looks like a flattened filing cabinet. The other is a battered 15-liter top-loader with two dividers, a padded base, and a couple of neoprene lens wraps loose in the bottom.
The 20-liter bag carries less gear.
That sounds wrong. We’ve been taught that more dividers mean more organization, and more organization means more capacity. But after years of testing bags, measuring interior volumes, and digging into why camera bags are designed the way they are, I’ve come to a different conclusion: the modular divider system, as we know it, is a relic of the 35mm SLR era. It solved a real problem in the 1980s. But today, its rectangular logic quietly works against how modern photographers actually carry, access, and protect their gear.
This isn’t an argument against padding or protection. It’s an argument against the grid.
The Padded Grid Didn’t Start With Photography
Early camera cases were fitted leather boxes. A photographer owned a body, a standard lens, maybe a portrait lens, and each piece sat in a custom-shaped cavity. There was no modularity because there was no need for it. The kit was stable.
That changed when 35mm SLR systems exploded. By the late 1970s and early 1980s, working photographers began carrying multiple primes, a zoom or two, a flash, and a growing pile of accessories. Rigid fitted cases couldn’t keep up. Bag makers - including Domke, Lowepro, Tenba, and Tamrac - popularized a new idea: a padded nylon shell lined with repositionable hook-and-loop walls. One bag could now be reconfigured for a newspaper shooter’s 24mm/50mm/105mm kit on Monday and a travel photographer’s body, zoom, and flash on Tuesday.
That was a genuine breakthrough. But the underlying design grammar was inherited from the most convenient source available: the rectangular box.
Think about how camera gear was sold and stored in that era. Lenses came in cylindrical cardboard boxes, but those boxes were packed into rectangular shipping cartons. Camera stores displayed bodies and lenses on slotted shelves. Toolboxes, briefcases, and flight cases used orthogonal compartments. When bag makers needed a flexible interior, they didn’t redesign around the shape of a lens; they miniaturized the logic of a shipping pallet. The bag became a portable cabinet of rectangles.
For a 1980s SLR kit, that mostly worked. An SLR body was a dense brick. Primes were similar enough in diameter that rows of vertical slots made sense. A standard 50mm f/1.8, a 24mm f/2.8, and a 105mm f/2.5 all stood upright in roughly equal cells. The rectangle was a reasonable fit.
But that geometry has aged badly.
The Geometry Tax: Why Your 20L Bag Carries 15L
Modern kits are no longer a collection of similar cylinders and one big brick. A mirrorless body is thin and L-shaped when a lens is attached. Primes can be tiny or enormous. Zooms are long, zoomed hoods are wider than the barrel, and batteries, filters, and microphones are flat, lumpy, or irregular. When you force these shapes into a grid of rectangular slots, you pay a quiet penalty.
I’ve measured this in more than a dozen popular camera bags. The label volume on a bag is not the usable volume after you install a divider set.
A single padded divider measuring roughly 270mm × 180mm × 12mm occupies about 0.58 liters. That’s just the wall. A typical 20-liter bag ships with six to nine dividers. Seven dividers consume over 4 liters before you pack a single lens. Then there are the corner voids: the empty spaces left when a cylindrical lens sits inside a rectangular cell. A 72mm-diameter lens standing upright in a 100mm × 110mm compartment uses only about a third of the cell’s footprint. The rest is dead space blocked by padded walls.
Across the bags I tested, a fully divided 20-liter interior usually delivered 14 to 16 liters of usable gear volume. You lose 20 to 30 percent to the divider system itself.
That’s not a design flaw in one bag. It’s a structural consequence of the rectangle-first approach.
The Weight Problem Nobody Talks About
The geometry tax isn’t just about wasted space. It also affects how the bag carries.
Modular dividers encourage vertical organization. Because the walls stand upright, most photographers place lenses standing on end, each in its own slot. That seems tidy, but it raises the bag’s center of gravity. A heavy 70-200mm f/2.8 standing vertically in the middle of a pack acts like a vertical load, concentrating weight higher off the base.
When you carry that bag on one shoulder, that higher center of mass increases torque on your spine and makes the bag swing more when you walk, bend, or reach for a door. If you’ve ever felt a camera bag lurch sideways when you kneel to shoot, you’ve felt this.
The same lens laid horizontally along the bottom of the bag lowers the center of gravity, reduces sway, and spreads the load across a wider area. But standard modular dividers rarely encourage that orientation. They’re built to make vertical slots, not horizontal channels.
Modular in Theory, Static in Practice
There’s another quiet failure in the modular divider promise: most photographers never actually reconfigure their bags.
The marketing says modularity means infinite flexibility. In practice, changing a divider layout requires pulling the bag open, ripping hook-and-loop apart, aligning walls, and pressing them back into place. It’s noisy. It takes two hands. It’s disruptive in a hotel room, and it’s nearly impossible to do quickly on the street.
So people set the interior once - often copying the manufacturer’s product photo - and then live with that configuration for years. The system is modular in design but static in use.
Worse, the grid trains you to overpack. Every empty slot becomes an invitation. A bag with eight individual cells makes you feel as though you should fill all eight, even if doing so adds weight without adding capability. The divider system doesn’t just organize gear; it subtly creates demand for more gear.
Three Case Studies
The Travel Photographer
A photographer I work with shoots documentary work with a mirrorless body, a 24-70mm f/4, a 35mm prime, an 85mm prime, and a small flash. Her old 20-liter bag had a dedicated slot for every item: body slot, three lens slots, flash slot, battery slot, filter slot. It looked beautifully organized.
But the same kit fit into a 15-liter soft insert with only two dividers and three neoprene wraps. The smaller setup weighed less, sat closer to her body, and left room for a light jacket and a water bottle. Access was faster because she wasn’t digging through six cells to find the right lens.
The fully divided bag didn’t increase protection meaningfully. The wraps and the outer shell did. The dividers mainly increased friction.
The Wildlife Shooter
A long telephoto is the ultimate test of the rectangular grid. A 150-600mm lens won’t fit upright in most shoulder bags. To fit it horizontally, you often need to remove several dividers and create a long channel. Many wildlife photographers end up pulling out the entire divider set and laying the lens on the padded base, using a few wraps for support.
At that point, the modular divider system is dead weight. The bag would be better off with a dedicated open-bottom cavity and a minimal number of bulkheads. Some specialized long-lens cases do exactly this. But many general-purpose bags still ship with a full grid that users immediately discard.
The Wedding Photographer
Wedding and event photographers often work with two bodies, two or three fast primes, a flash, and dozens of batteries and cards. Speed matters more than neatness. A fully divided bag forces a sequence: open the right flap, find the right cell, lift the item out, close the flap, repeat.
That’s fine for storage. It’s terrible for working.
Many wedding shooters have abandoned heavily divided shoulder bags in favor of open-top holsters, belt systems, or shallow buckets with a single central wall. The active body sits lens-down, ready to grab. Backup lenses sit in padded wraps or shallow pouches. The working zone is open; the reserve zone is separated. That’s a different logic from the cubicle grid - and it’s faster.
What Other Fields Already Know
Photography didn’t invent padded carrying systems. It borrowed from luggage, toolboxes, and flight cases - and then stopped evolving.
Hiking packs, for example, solved this problem differently. They use zones, not universal grids. A sleeping bag compartment is shaped for a sleeping bag. A top lid is for small items. A side zipper gives access to a hydration sleeve. Each zone is specialized, and the pack isn’t endlessly reconfigurable. It’s designed around how people actually move.
Tool rolls and medical instrument wraps do something even more relevant. They use elastic loops and rolled layers to hold cylindrical, irregular objects without rectangular partitions. The tool conforms to the holder, not the other way around.
Architecture offers the same lesson. An office building made entirely of identical cubicles is modular, but it’s not adaptable. Good spaces use a mix of open zones, storage walls, and movable furniture. The goal is flow, not maximum partitioning.
The camera bag industry has started to nod toward this. Peak Design’s FlexFold dividers can fold around a lens instead of forming only straight walls. Shimoda’s Core Units make the padded insert modular at the bag level rather than the item level. Domke wraps have quietly been doing a better job than many dividers for decades. But these are partial corrections. Most bags still ship with a full rectangular grid as the default.
The Next Shift: From Grid to Adaptive Cavity
I don’t think the future of camera bag interiors is more dividers. I think it’s fewer, smarter boundaries.
Laser-cut foam is already a hint. A properly cut foam insert for a mirrorless kit can hold the same gear in 20 to 30 percent less volume than a padded divider grid because it subtracts only the shape of the gear, not a rectangle around the gear. The problem with foam is that it’s static. Change a lens, and the insert no longer fits.
The next step is likely subtractive padding that is also reconfigurable. Some possibilities are already visible in materials and manufacturing:
- Non-Newtonian foams like D3O remain soft and flexible at rest but stiffen on impact. A thin conforming sheet could replace thick padded walls without giving up protection.
- 3D-printed TPU lattices could be generated from a phone scan of your exact kit. You’d get a custom cradle that flexes, weighs less than foam, and can be reprinted when your kit changes.
- Inflatable bladders could hold gear in place with air pressure, then deflate for repacking. This is already used in some sports and medical carrying systems.
- Magnetic segmented panels could snap to a bag’s frame and bend around curved lenses instead of forming only straight walls.
None of these are perfect yet. But they share a common design philosophy: the interior should adapt to the object, not force the object into a rectangle.
That’s a meaningful shift. The current system is additive - you start with an empty box and add walls. The next system will be subtractive - you start with a shaped, protective volume and remove only what you don’t need.
How to Work Better With the Dividers You Already Have
You don’t need to throw out your current bag. But you can stop treating it like a filing cabinet.
Start by removing every divider that isn’t load-bearing. Keep a padded base. Keep one central wall if it separates a working zone from a reserve zone. Then test the bag. If gear isn’t protected, add one divider back. Repeat.
Lay heavy lenses horizontally along the bottom instead of standing them upright. Use neoprene wraps or small padded pouches for primes, batteries, and filters. Wraps conform to the gear, create no dead corners, and let you pack soft items around hard ones.
Think of the bag as a carry system, not a display case. The active body should be reachable in one motion. The reserve lenses should be accessible without moving three other items. The support items - batteries, cards, filters - can live in a single open pouch, not five individual cells.
If a divider isn’t preventing two hard objects from colliding during a fall, remove it. Soft items can touch. Hard items need selective separation, not universal compartmentalization.
The Rectangle Was a Starting Point, Not a Destiny
Modular dividers were a smart answer to a specific historical moment. They let one bag serve many 35mm SLR kits, and they helped working photographers move faster than rigid fitted cases ever could.
But the rectangle was a starting point, not a permanent truth. Cameras changed. Lenses changed. The way photographers work changed. The interior of the camera bag, for the most part, did not.
The best camera bag of the next decade probably won’t have more dividers. It will have fewer, better-placed boundaries - or none at all in the traditional sense. It will use adaptive materials, zoned access, and subtractive padding to fit the shape of the work.
And if you’re evaluating a bag today, the question isn’t how many ways you can rearrange the walls. It’s whether the bag helps you move, shoot, and pack without fighting the grid.