I’ve dropped a camera exactly once in my career. It was a brand new DSLR, and it slipped off my shoulder as I was scrambling over some rocks in Utah. The bag hit the sandstone with a sound I can still feel in my stomach. I opened it up expecting the worst-cracked LCD, misaligned lens mount, a very expensive paperweight. The camera was fine. The lens was fine. The only casualty was a slightly compressed foam divider. That’s the moment I started thinking about the foam. Not just as packing material, but as a piece of engineering that’s quietly carried photography from the studio to the summit of Everest. The padded cells inside your camera bag aren’t just a convenience-they’re a material history of how we’ve learned to take risks with our gear.
The Days Before Foam: Wood, Leather, and Hand-Carrying Everything
Before foam, there was basically trust and a lot of careful walking. Early field cameras in the 1850s onward traveled in wooden cases lined with felt, velvet, or wool batting. A 1903 Rochester Optical Co. catalog shows “vulcanized fiber” cases with interior wooden blocks carved to the exact shape of an 8×10 camera and its holders. It looked beautiful, but wood transmits shock directly into brass and mahogany joints. Drop the case, and you were likely cracking a lens standard. The unspoken rule was simple: you hand-carried your gear, which tethered large-format photography to paths, wagons, and studios. Street photography? Forget it. You weren’t chasing light with a 20-pound wooden crate.
The 1930s brought smaller rangefinders and the first “ever-ready” cases-leather over stiff cardboard, often with cotton webbing dividers and a thin felt lining. They protected against scratches, but a two-foot drop could still knock a Leica III’s rangefinder out of alignment. The real change came from an unexpected place: World War II.
War Surplus, Aviatior Life Vests, and the DIY Revolution
The military needed something light and tough to protect binoculars, bombsights, and aerial camera lenses. They turned to sponge rubber and a newly developed closed-cell foam called neoprene. These materials worked by deforming on impact and then bouncing back, which was lightyears ahead of felt. When the war ended, surplus flooded army-navy stores, and photographers got creative.
I love this story: in a 1954 letter to Popular Photography, a guy named David G. Powell described gutting a surplus mortar ammunition case and lining it with “sponge rubber cut from an old aviator’s life vest” to carry his Rolleiflex and three lenses. That’s the first real camera bag insert-improvised, shock-absorbing, and fully customizable. The idea spread fast through camera clubs. By the 1960s, companies like Tenba (founded by a war correspondent) and Tamrac were selling bags with “shock-absorbing inserts,” mostly polyurethane open-cell foam sealed in a vinyl skin. These were a huge leap forward, but they had a fatal flaw: open-cell foam soaks up water like a sponge. Once saturated, it loses its springiness and eventually crumbles. Photographers working in humid climates learned this the hard way-their dividers literally turned to dust after a few rainy seasons.
What’s Actually Inside Your Dividers: A Quick Material Breakdown
Understanding the foam inside your bag is one of those things that instantly makes you a savvier buyer. Most modern inserts use a core of closed-cell polyethylene (PE) or cross-linked polyethylene (XLPE) foam. Closed-cell means the bubbles inside don’t connect, so it won’t absorb water, it floats, and it keeps its shape after repeated impacts. According to data from foam manufacturer Zotefoams, a 6mm-thick sheet of XLPE can absorb about 90% of the impact energy from a 1-meter drop for a load up to 2 kg-right in the sweet spot for a pro DSLR or medium-format kit.
Open-cell polyurethane, on the other hand, is that soft, squishy stuff. Great for preventing scratches, useless for real impact protection. Premium bags from F-Stop or Shimoda often use a hybrid: a rigid closed-cell skeleton laminated with an open-cell face, giving you structure and a gentle touch.
A 2017 PetaPixel test drove this home. They dropped a Nikon D810 with a 24-70mm lens from 1.2 meters onto concrete, first inside a cheap pure open-cell insert, then inside a closed-cell hybrid. The pure open-cell insert transmitted enough shock to slightly dislodge the lens mount. The hybrid-protected camera didn’t have a scratch. The takeaway is simple: if your divider feels like a pool noodle, it’s better than a wool blanket, but it’s not real protection.
- Closed-cell PE/XLPE: Water-resistant, high impact absorption, structural, found in quality dividers.
- Open-cell polyurethane: Soft, absorbent, degrades over time, gives a plush feel but poor shock protection.
- Hybrid construction: Best of both worlds-closed-cell core, open-cell face, typical in pro-oriented bags.
The Velcro Revolution and Why We All Started Carrying Too Much Gear
The 1970s brought the SLR boom, and with it, a growing collection of interchangeable lenses, motor drives, and zooms. Photographers needed bags that could change shape overnight. The answer was the Velcro-in divider system, commercially pioneered by Dominic Benavides for his Domke bags. The innovation wasn’t the foam itself-it was the modularity. Suddenly, you could tear out a divider, reconfigure your kit from a portrait setup to a wildlife rig, and go.
But this flexibility had an unintended side effect: it invited us to carry more. A 1983 survey in Camera & Darkroom found that the average photojournalist’s working bag jumped from 14 pounds in 1968 to 22 pounds in 1982. The foam insert had evolved to allow an extra body, a flash, and a long telephoto to coexist without knocking together, and we happily filled every last cubic inch. I still recognize that impulse-how many times have I packed a third lens “just in case” simply because the divider walls let me?
The Mirrorless Shift and the Danger of Going Too Slim
By the mid-2000s, mirrorless cameras arrived and suddenly a full-frame system could slip into a bag originally designed for a single DSLR and a 70-200mm. The foam responded. Brands like Peak Design and WANDRD introduced ultra-slim dividers using high-density cross-linked foams as thin as 5mm. These are stiff enough to support a heavy lens vertically without buckling, but they let you reclaim precious space. The new mantra became precision fit: keep gear from shifting during a sprint through O’Hare, rather than just absorbing a catastrophic drop.
There’s a trade-off, though. Some bags now rely so heavily on the insert’s slim walls that they leave gaps at the top or bottom. I’ve seen a lens get dented when a bag tipped over onto a corner because the foam only protected the sides. Real protection isn’t just a spec on a sheet-it’s the complete geometry of how the insert meets the bag shell. A 5mm wall won’t save you if the camera can slide forward and smack the zipper.
Where Foam Is Headed: 3D Printing, Lattices, and Algae
Right now, the most exciting developments are happening outside traditional bag design. I’ve had colleagues send 3D scans of their kit to companies like MyCaseBuilder, who CNC-mill a closed-cell foam block so it cups every dial, grip, and lens hood with sub-millimeter precision. It’s the modern equivalent of that 1903 wooden carved case, only lighter and astronomically more protective.
The next step is lattice-structured foams-3D-printed inserts with graded density zones. Imagine an insert that’s stiff right where the lens mount needs support and soft around the body to absorb vibration. Companies like Carbon and Desktop Metal are already printing elastomeric lattices for medical equipment, and the same tech could yield a camera insert that weighs 40% less than a standard foam block while offering better shock isolation.
Then there’s the environmental angle. Most polyethylene foam is petroleum-based and a recycling nightmare. Bio-based closed-cell foams made from sugarcane or algae are starting to appear in outdoor gear. A 2022 study in ACS Sustainable Chemistry & Engineering showed a foam made from lignin and plant oils that matched polyethylene’s damping properties. So your future insert might be compostable-though I’d still keep it dry.
The Foam Tells a Story About Us
The foam insert is a physical timeline of our relationship with risk. It started with stationary wooden crates for stationary cameras. It morphed into military surplus rubber, then into endlessly reconfigurable Velcro walls that let us chase stories anywhere. Now it’s shrinking into barely-there skeletons that encourage us to go lighter and further.
Next time you rip open a divider to grab a lens, maybe pause a second. That little padded wall is an archive of decisions-engineering choices, environmental compromises, cultural shifts in how we photograph. It didn’t just protect our gear; it helped cameras leave the studio, climb mountains, and document the world. The foam isn’t a hidden secret. It’s a beautifully functional piece of history you can hold in your hand.