A waterproof backpack for a mirrorless body with two lenses and a folded drone needs 22 to 30 litres, 8 to 12 millimetres of closed-cell padding in the camera compartment and an IPX6 rating for shore and boat work, rising to IPX7 if the pack can end up in the water. Volume is the first decision and it is arithmetic rather than preference: a mirrorless body occupies 0.6 to 1.2 litres, a 70-200 mm f/2.8 lens 2.2 to 3.0 litres, a folded drone of the 900 gram class 1.8 to 2.6 litres and a controller 0.9 to 1.4 litres, and the pack has to hold all of it plus dividers, which consume 1.5 to 2.5 litres of their own. Padding of 8 to 12 millimetres survives a one metre drop onto concrete; 5 millimetres does not. Twenty to 40 grams of silica gel per 10 litres keeps a sealed compartment below 50 percent relative humidity, which is the level at which lens fungus stops being a risk. This page sets out the sizing maths, the water exposure levels, the battery rules and the field maintenance that keeps the kit alive.
Size the Pack Around the Kit, Not the Other Way Round
Camera packs are sold by litre and camera kits are measured in objects, and the gap between the two is where most buying mistakes happen. The reliable method is to add up the kit first, add 1.5 to 2.5 litres for the divider set, add roughly 15 percent for the fact that rectangular objects never pack as tightly as their volumes suggest, and only then look at pack sizes. A kit totalling 17 litres of gear needs a 24 to 26 litre pack, not a 20 litre one.
| Item | Volume occupied | Weight | Packing note |
|---|---|---|---|
| Mirrorless body | 0.6 to 1.2 L | 450 to 700 g | Body only, no lens attached |
| DSLR body with grip | 1.4 to 2.2 L | 900 to 1,400 g | Needs a taller compartment |
| 24-70 mm f/2.8 | 1.1 to 1.5 L | 800 to 900 g | Usually travels mounted |
| 70-200 mm f/2.8 | 2.2 to 3.0 L | 1,300 to 1,500 g | Lays flat, dictates compartment depth |
| 16-35 mm f/2.8 | 0.8 to 1.1 L | 600 to 700 g | Short, packs sideways |
| Two spare batteries and charger | 0.4 to 0.7 L | 300 to 500 g | Keep accessible for air travel |
| Folded drone, 900 g class | 1.8 to 2.6 L | 700 to 950 g | Arms folded, props removed |
| Drone controller | 0.9 to 1.4 L | 400 to 700 g | Sticks need rigid protection |
| 15 inch laptop | 1.6 to 2.2 L | 1,400 to 2,000 g | Separate welded sleeve |
Two items in that list drive the compartment shape rather than its volume. A 70-200 mm f/2.8 lens is 180 to 210 millimetres long, and a pack whose camera compartment is shallower than that forces the lens to travel diagonally, which wastes 2 to 3 litres and puts the mount under lateral load. A drone controller is the opposite problem: it is short but has protruding sticks, and it needs a rigid shell or a padded lid rather than a soft divider.
The laptop deserves separate treatment, because it is the item most often lost to water in a pack that is otherwise doing its job. A camera compartment opened repeatedly in rain admits water faster than a closed welded body excludes it, which is why the laptop should sit in its own welded or highly water-resistant sleeve rather than in the same space as wet gear. The construction detail is set out in the laptop protection guide, and larger machines are covered in the 17 inch sleeve guide.
Volume Bands and What Fits
Once the kit maths is done, four volume bands cover almost every working configuration. The useful observation is that the jump from 20 to 30 litres buys the ability to carry a drone alongside a camera kit, while the jump from 30 to 40 litres buys a second body and a tripod. Most photographers overestimate what they need and end up carrying a pack whose empty volume lets the kit shift in transit, which is itself a cause of damage.
| Pack volume | Fits comfortably | Empty weight | Best assignment |
|---|---|---|---|
| 15 to 20 L | One body, two lenses, no drone | 0.9 to 1.3 kg | Street and travel |
| 22 to 30 L | One body, three lenses, folded drone | 1.2 to 1.8 kg | Field and shore work |
| 30 to 38 L | Two bodies, four lenses, drone and controller | 1.6 to 2.3 kg | Assignment and expedition |
| 40 L and up | Two bodies, long glass, tripod, laptop | 2.0 to 2.8 kg | Multi-day remote work |
Empty weight matters more than it appears to in that table, because a camera kit is dense. Nine kilograms of camera gear in a 1.8 kilogram pack gives a total near 11 kilograms, and above roughly 10 kilograms the harness decides whether the day is workable. Load lifters, a sternum strap and a hip belt that transfers 60 to 70 percent of the weight to the hips are the features to look for, and a pack without a functional hip belt should not be considered above 8 kilograms regardless of its waterproof rating.
Photographers walking any distance with that load should read the waterproof hiking backpack guide alongside this one, because the harness engineering that makes 11 kilograms comfortable on a trail is the same engineering that makes it comfortable on a shore walk, and it has nothing to do with waterproofness.
Water Exposure Levels for Camera Work
Camera gear fails from water in three distinct ways and each corresponds to a different rating, so the right question is not whether the pack is waterproof but which exposure it will actually meet. Light rain and a brief exposure while changing a lens is IPX4. Spray from a bow wave, surf or a waterfall is IPX6, which is defined against a powerful water jet. Falling in the water with the pack is IPX7, which means 30 minutes at one metre, and it is the level worth specifying whenever the pack is used from a kayak or a small boat.
| Situation | Exposure | Recommended rating | Consequence of under-specifying |
|---|---|---|---|
| Urban and travel shooting | Rain, brief | IPX4 | Wet outer pockets, gear usually safe |
| Waterfall and coastal spray | Sustained spray | IPX6 | Water tracks into the camera compartment |
| Kayak, SUP and small boat | Immersion risk | IPX7 | Total loss of the kit on a capsize |
| Wading river crossings | Partial immersion | IPX7 | Water enters through the harness side |
| Underwater housing support | Splash and rinse water | IPX6 | Sealed housing carries the risk |
The rating scale is defined in IEC 60529 and reading it correctly prevents the commonest expensive error in this category, which is buying a pack described as waterproof with no code behind the word. A rating without a number is not a rating, and the difference between IPX6 and IPX7 on a kayak is the difference between a wet pack and a lost camera. The codes and their test conditions are set out in full in the rating reference published by IEC.
One caveat applies specifically to camera packs and is worth stating plainly: an IPX7 body with a camera compartment that opens on the outside is only as good as the closure of that compartment. A rear-access panel with a coated zip and a storm flap reaches roughly IPX5 on its own, which is why serious water work favours a top or side opening under a roll-top collar rather than a large rear panel. The closure trade-off is analysed in the photography backpack comparison.
Padding, Dividers and Shock Protection
Padding is the second specification that separates a camera pack from a general waterproof pack, and it is measurable. Eight to 12 millimetres of closed-cell foam in the dividers and 12 to 15 millimetres in the base is the working range, corresponding to surviving a one metre drop onto concrete with a 1.5 kilogram body inside. Below 6 millimetres the foam bottoms out on impact and the load transfers straight to the lens mount, which is the component most likely to fail and the most expensive to repair.
| Element | Specification | Failure below this | Test reference |
|---|---|---|---|
| Divider foam | 8 to 12 mm closed-cell EVA | Bottoms out on a 1 m drop | Drop and impact methods from ASTM |
| Base panel | 12 to 15 mm, rigid insert | Deforms under a long lens | Same, with the heaviest item |
| Lid or top pad | 6 to 10 mm | Transfers load to the eyepiece | Compression set after 72 hours |
| Divider attachment | Hook and loop, 25 to 40 mm | Dividers shift in transit | Cyclic peel testing |
| Compartment shell | Bonded, no stitch through panel | Leak path at every needle hole | Seam integrity check |
Cushioning performance is not a matter of thickness alone, because the same foam behaves differently at different temperatures and impact speeds. Closed-cell EVA in the 45 to 60 Shore A range is the usual choice and it stiffens noticeably below freezing, which matters for winter work: a pack dropped onto frozen ground at minus 15 degrees transmits more shock than the same drop at 20 degrees. Physical test methods for cushioning and impact are published by ASTM, and a specification that quotes a drop height without quoting a temperature is incomplete.
Divider attachment is the quiet failure. Hook and loop of 25 to 40 millimetres holds a divider against the shifting of a walking gait; narrower tape does not, and a divider that migrates during a three hour walk leaves a lens resting against a body. The check is simple and worth doing in a shop: load the compartment, close it, invert the pack and see whether anything moves.
Condensation, Humidity and Desiccant
Water gets into a camera compartment by two routes and only one of them is rain. The second is condensation, and it catches photographers out because it happens inside a pack that is demonstrably dry. Moving a camera from a cold environment into warm humid air drops the body below the dew point and water forms on the coldest surface, which is usually the front element. The rule of thumb is that a temperature difference of 10 degrees Celsius at 70 percent relative humidity is enough to cause it.
| Control | Value | How often | Notes |
|---|---|---|---|
| Compartment humidity target | Below 50 percent RH | Continuous | Fungus risk rises sharply above 60 percent |
| Silica gel load | 20 to 40 g per 10 L | Replace or regenerate every 3 to 6 months | Indicating gel changes colour at 40 percent |
| Acclimatisation before opening | 20 to 30 minutes | Every cold to warm move | Let the pack reach air temperature first |
| Air exchange | Open and air weekly | Weekly in storage | A sealed pack holds whatever moisture it trapped |
| Wet gear separation | Welded wet pocket, 4 to 8 L | Every wet day | Never store a wet rain cover with the body |
Lens fungus is the reason that humidity target exists, and it is worth taking seriously because it is permanent. Fungal growth becomes a realistic risk above about 60 percent relative humidity sustained over weeks, and it etches the element coating rather than sitting on it, so a lens that has grown fungus is a lens that has lost contrast permanently. A dry compartment with active desiccant is the entire defence, and it costs under 5 USD a season.
Storage is where most fungus starts, not field use. A pack put away damp after a wet day, closed and left for a month, is an ideal incubator, and the fix is boring: open every compartment, remove the desiccant, air the pack for 24 hours and store it with the dividers out and the collar unrolled. A pack stored open in a dry room will never grow anything.
Drone Gear: Props, Batteries and Controllers
Drone kit changes the packing problem in three ways that camera-only packs do not anticipate. Props are sharp and bend if stored under load, controllers have protruding sticks that need rigid protection, and lithium batteries are a regulated item with their own transport rules. All three are manageable in a general waterproof pack provided the compartments are chosen with them in mind.
| Item | Packing requirement | Risk | Mitigation |
|---|---|---|---|
| Propellers | Flat, unloaded, in a rigid sleeve | Bent blade causes vibration | Props off the drone, stored flat |
| Controller | Rigid shell or padded lid | Broken sticks | Never compress against the body |
| Batteries up to 100 Wh | Carry-on only, terminals protected | Short circuit in transit | Terminal covers or individual pouches |
| Batteries 100 to 160 Wh | Airline approval, usually two spares | Confiscated at security | Check the carrier before flying |
| Charging hub | Ventilated, never charged in a closed pack | Heat build-up | Charge on a hard surface outside the pack |
The battery rules are the part that catches people at airports rather than on water. Cells up to 100 watt-hours go in carry-on without approval, cells of 100 to 160 watt-hours need airline approval and are usually limited to two spares, and anything above 160 watt-hours is not carried as a spare at all. A typical drone battery of the 900 gram class is 40 to 77 watt-hours, so three or four spares fit inside the limit, but a large cinema drone pack can exceed it and should be checked against the carrier before booking.
Charging is the second safety point and it is not obvious. A charging hub running inside a closed pack on a hot day can reach 60 degrees Celsius or more, which is above the storage rating of most lithium polymer cells and is how drone batteries are damaged outside the aircraft. Charge on a hard, open surface, never inside a closed compartment, and never charge a cell that has been immersed or crushed.
Field configurations for this kind of kit, including how a pack is strapped down and kept reachable while working, are covered in the drone field work guide, which also deals with securing a pack to a kayak or a boat deck.
Salt, Sand and Field Maintenance
Coastal and desert work destroys camera packs faster than water does, and the mechanisms are different in each case. Salt spray leaves a hygroscopic residue that holds moisture against fabric and corrodes metal, and it does its damage slowly and out of sight, usually at the zip and the hardware. Sand is worse mechanically: grains of 0.2 to 0.5 millimetres work into zip teeth and slider mechanisms, and a single season of beach work can seize a closure that was smooth when new.
| Exposure | Damage mechanism | Field action | Interval |
|---|---|---|---|
| Salt spray | Hygroscopic residue, corrosion | Rinse with fresh water, air dry | Every saltwater day |
| Sand and dust | Abrasion in zip teeth and sliders | Blow out with air, brush the tape | Every desert day |
| Chlorinated water | Film on fabric and print | Fresh water rinse | After poolside work |
| Sustained rain | Saturation of the harness foam | Dry open, away from heat | After every wet day |
| Freezing conditions | Film stiffens, foam hardens | Acclimatise before flexing | Every cold trip |
Drying is where most damage is either prevented or caused. A pack dried closed, in a cupboard or in a hot car will trap moisture against a welded liner and grow mould in 24 to 48 hours above 60 percent relative humidity. A pack dried open, in moving air, at 20 to 25 degrees Celsius and out of direct sun takes 6 to 12 hours and damages nothing. Heat is the thing to avoid: a radiator or a tumble dryer will distort a TPU film and void the seam integrity that the rating depends on.
Zips deserve their own line in the maintenance routine. A coated or airtight zip that has been in salt water should be rinsed with fresh water, dried, and then lubricated with the product recommended for that closure, roughly every 20 to 30 saltwater days. Skipping this is the single commonest cause of a closure that fails while the body of the pack is still perfectly sound.
Access Design and Working Speed
The last specification is the one photographers care about most and the one least often written down: how long it takes to get the camera out. It is measurable and the spread is wide. A side access panel with a single fastener reaches the body in 3 to 5 seconds, a rear panel in 6 to 10, and a top loader with a roll-top collar in 12 to 20, because the collar has to be unrolled and the contents lifted out from above. In surf or rain, those seconds are the difference between a shot and a wet camera.
- Side access: 3 to 5 seconds, single fastener, best for surf and wildlife where the moment does not wait.
- Rear panel access: 6 to 10 seconds, the most secure against theft and the lowest water rating on the closure.
- Top loader under a roll-top: 12 to 20 seconds, the highest water integrity and the slowest to work from.
- Front flap: 8 to 12 seconds, a reasonable compromise but it puts the flap on the ground when opened.
- Harness-mounted clip or capture clip: under 2 seconds, and worth adding to any configuration.
The honest trade-off is between access speed and water integrity, because every opening in a welded body is a place where water can enter and a large rear panel is the biggest opening of all. A photographer working mostly in cities should optimise for access; one working from a kayak or in surf should optimise for the closure and accept the slower reach. There is no configuration that maximises both, and any product claiming otherwise should be treated with suspicion.
Aquagrip builds camera and drone configurations to those specifications: 500 pcs per design and colour, samples in 6 to 10 working days, bulk in 35 to 50 days, FOB Xiamen or DDP to more than 100 countries, with every bulk order inspected at AQL 2.5 before shipment. Programme records, divider layouts and the inspection archive are held. Closure options are described in the waterproof backpack overview, and marine forecasts for coastal shoots are issued by NOAA.
People Also Ask
How many litres does a mirrorless camera with two lenses need?
15 to 20 litres. A mirrorless body is 0.6 to 1.2 litres, a 24-70 mm f/2.8 is 1.1 to 1.5 and a 70-200 mm f/2.8 is 2.2 to 3.0, plus 1.5 to 2.5 litres for dividers and about 15 percent for packing inefficiency.
Why does a camera bag need to be waterproof rather than water-resistant?
Because camera gear fails from spray and immersion, not from light rain. Water-resistant fabric wets out under a sustained jet, which is the IPX6 condition created by a bow wave, surf or a waterfall, and a single immersion is a total loss of the kit.
What is the safest way to carry camera gear on a kayak?
An IPX7 pack strapped to the deck with the collar above the waterline, or a floating pack if it is not strapped. IPX7 covers 30 minutes at one metre, while IPX6 does not cover immersion at all.
Do I need to remove batteries before flying with a drone?
They must travel in carry-on rather than in the hold, with terminals covered. Cells up to 100 watt-hours need no approval, cells of 100 to 160 watt-hours need airline approval and are usually limited to two spares.
How do I dry a wet camera backpack without damaging the gear?
Open every compartment, remove the desiccant and air it at 20 to 25 degrees Celsius in moving air for 6 to 12 hours. Never dry it closed, never use a radiator or a tumble dryer, since heat distorts a TPU film and voids the seam integrity.
What causes lens fungus and does a waterproof pack prevent it?
Sustained relative humidity above about 60 percent over weeks, which etches the element coating permanently. A waterproof pack helps only if the compartment is kept dry: 20 to 40 grams of silica gel per 10 litres holds it below 50 percent.
Frequently Asked Questions
Q1. What size waterproof backpack do I need for a camera kit?
15 to 20 litres for one body and two lenses, 22 to 30 litres for one body, three lenses and a folded drone, and 30 to 38 litres for two bodies with a controller. Add 1.5 to 2.5 litres for dividers and 15 percent for packing inefficiency.
Q2. Will a waterproof backpack protect my camera from rain?
Yes at IPX4 or above for rain, but rain is not the exposure that damages gear. Sustained spray needs IPX6 and immersion needs IPX7, so the rating should match the worst exposure the pack will meet rather than the weather it was bought for.
Q3. Can I take a drone and controller in the same pack as a camera?
Yes, in 22 to 30 litres. Keep props flat in a rigid sleeve, protect the controller sticks from compression, and never charge a battery inside a closed compartment, where a charging hub can exceed 60 degrees Celsius.
Q4. How do I stop condensation forming on my lens?
Let the pack reach air temperature before opening it, 20 to 30 minutes after any cold to warm move. Condensation forms when the body sits below the dew point, which a 10 degree Celsius difference at 70 percent relative humidity is enough to cause.
Q5. How much padding should a camera compartment have?
8 to 12 millimetres of closed-cell EVA in the dividers and 12 to 15 millimetres in the base, which survives a one metre drop onto concrete with a 1.5 kilogram body inside. Below 6 millimetres the foam bottoms out and the load reaches the lens mount.
Q6. Can I fly with lithium drone batteries in my backpack?
Yes in carry-on, with terminals covered. Cells up to 100 watt-hours need no approval, cells of 100 to 160 watt-hours need airline approval and are usually limited to two spares, and anything above 160 watt-hours cannot travel as a spare.
Q7. Is IPX6 enough for kayak photography?
Only if the pack cannot end up in the water. IPX6 covers a powerful jet but not immersion; IPX7 covers 30 minutes at one metre and is the correct level whenever a capsize is possible, since a capsize is a total loss at IPX6.
Q8. How do I clean salt spray off a camera backpack?
Rinse with fresh water after every saltwater day, paying attention to the zip and the hardware, then dry open at 20 to 25 degrees Celsius. Salt residue holds moisture against the fabric and corrodes metal slowly and out of sight.
Q9. Can I use a normal camera insert inside a waterproof pack?
Yes, and it is a good way to convert a general pack. Check that the insert plus the kit leaves room to close the collar properly, since a roll-top that cannot be rolled three turns does not reach its rating.
Q10. Does a waterproof backpack float if it goes overboard?
Only if it is designed to. A sealed roll-top with trapped air will float briefly with 5 to 10 litres of air and about 8 kilograms of gear, but a pack with an open compartment will sink. For kayak work, specify a floating design.
Q11. How much weight can I carry comfortably with camera gear?
Up to 8 kilograms in any pack, and above 10 kilograms only with a hip belt that transfers 60 to 70 percent of the load to the hips, plus load lifters and a sternum strap. Above 10 kilograms the harness, not the volume, decides the day.