Drone Hard Case: Sizing Guide for DJI Mini, Air and Mavic

Size a drone hard case from the drone's folded dimensions plus the controller, with at least 20 mm of foam on every side of each item. A DJI Mini 3 or Mini 4 Pro with a DJI RC 2 fits an 11.7 litre case such as the Vantage 270S. An Air 3 or Air 3S needs about 30 mm more depth, and a Mavic 3 Pro a longer case again. Below: DJI's folded sizes, the maths, and which case fits which kit.

Why drones need a hard case more than cameras do

A drone is thin arms, a gimbal hanging off the front and four sets of propellers, all built to be light. The weak points are exactly the parts a soft bag presses on:

• The gimbal. A knock to the camera head can bend the gimbal arm or strain the ribbon cable. Keep the gimbal cover on and give the front of the drone its own foam pocket.
• The arms and hinges. Folding arms take load at the hinge. If the case lid presses on a raised arm, that hinge carries the weight of everything stacked on top.
• The propellers. A bent or chipped prop can cause vibration or a failed flight. Props should sit folded against the body, never pinned under another item.
• The batteries. Lithium packs need to stay dry, cool and away from anything that can puncture or short them.

Add Indian conditions to that list: dust on a ghat road, a sudden monsoon shower at a wedding venue, a car boot parked in the May sun. A sealed, crushproof case with foam cut to the exact shape of the drone handles all of it.

Start with the maker's folded dimensions

Never size a drone case from memory or from a listing on a marketplace. Take the folded size, without propellers, from the manufacturer's own specification page. These are DJI's published figures, length x width x height:

• DJI Mini 3: 148 x 90 x 62 mm folded
• DJI Mini 4 Pro: 148 x 94 x 64 mm folded
• DJI Air 3: 207 x 100.5 x 91.1 mm folded
• DJI Air 3S: 214.19 x 100.63 x 89.17 mm folded
• DJI Mavic 3 Pro: 231.1 x 98 x 95.4 mm folded

The controller matters as much as the drone. DJI lists the DJI RC 2 at 168.4 x 132.5 x 46.2 mm without control sticks and 62.7 mm tall with the sticks fitted. The DJI RC-N3, listed on DJI's Air 3S specification page, is 104.2 x 150 x 45.2 mm. If your kit came with a different controller, measure it with a steel rule, sticks on.

The 20 mm rule, and how to do the maths

Every item needs at least 20 mm of foam between it and the case wall, and at least 20 mm between it and the next item. That foam is what absorbs a drop. So for each axis:

1. Lay the drone and controller side by side the way you want them to sit.
2. Add up the lengths along one axis, plus 20 mm for each gap and each wall. Do the same across.
3. For depth, take the tallest item and add 40 mm (20 mm under, 20 mm over).
4. Compare all three numbers with the case's inner dimensions, never the outer size.

Worked example, Mini 4 Pro and RC 2 side by side: 20 + 148 + 20 + 168.4 + 20 = 376.4 mm long. Across, the controller is the wider item: 20 + 132.5 + 20 = 172.5 mm. Depth: the RC 2 with sticks fitted is 62.7 mm and the drone is 64 mm, so 64 + 40 = 104 mm. The Vantage 270S is 380 x 270 x 115 mm inside. Every number fits, and the spare width becomes pockets for batteries and a charger.

If you would rather not do this by hand, the Hard Case Size Finder runs the same check against every size.

Which case fits which DJI kit

All figures below use DJI's folded dimensions and the 20 mm rule. Inner case sizes are in millimetres.

The Air 3 and Air 3S are too tall for the 270S: 91.1 mm plus 40 mm of foam is 131.1 mm, and that case is 115 mm deep. The table covers drone, controller and a battery row; add ND filters, a charging hub or spare props to the layout before choosing. When in doubt, go one size up.

Batteries: what goes where

DJI rates the Mini 4 Pro's standard battery at 18.96 Wh and the Plus battery at 28.4 Wh. The Mini 3 standard battery is 18.1 Wh. The Air 3 battery is 62.6 Wh, the Air 3S battery 62.5 Wh and the Mavic 3 Pro battery 77 Wh. All of these are under 100 Wh.

Under IATA's passenger guidance, spare lithium ion batteries of 100 Wh or less go in carry-on baggage only, never checked, with a limit of 20 spares per person. Each spare must be protected from short circuit, in its retail packaging, with the terminals taped, or in its own pouch. A device left in checked baggage must be fully switched off and protected from damage. Airlines can add their own rules on top, so check with yours before you fly.

In practice that means: if the drone case goes in the hold, take every battery out and carry them in the cabin in a battery pouch. If the case is small enough for the cabin under your airline's rules, it can stay packed. Compare the airline limit with the case's outer size; the Vantage 270S is 414 x 345 x 129 mm outside. Our guide to flying with camera gear in India covers the rest.

Flying, hill stations and the pressure valve

A fully sealed box has a quirk. Close it at sea level, take it up a mountain road or through a flight, and the air pressure inside and outside no longer match. On a case without a vent, the lid can lock shut under vacuum after an altitude or temperature change, and you end up fighting the latches at the launch point.

Vantage cases have an automatic pressure equalisation valve. It lets the pressure balance so the lid opens normally after a drive up to a hill station or a flight, while the case stays sealed against water. The waterproof rating is IP67: dust-tight, and protected against immersion to 1 metre for 30 minutes.

Cutting the foam for a drone

Vantage cases ship with solid foam sheets, a snap-off foam cutter and convoluted foam in the lid. That lets you cut a pocket that follows the shape of the folded drone rather than a rough rectangle.

• Trace the folded drone, not the box it came in. Put the gimbal cover on, fold the arms and props, then trace around it with a marker held upright.
• Give the gimbal end extra support. Leave a foam shelf under the front so the camera head does not hang.
• Cut the controller pocket with sticks fitted, or cut two small slots for the removed sticks so they never go missing.
• Add a finger slot beside the drone and controller so you can lift them out without pulling on an arm.

For the step by step method, see how to cut foam for a camera case.

Common mistakes

1. Buying by outer size. Across the Vantage range the outside is between 5 and 87 mm bigger than the inside, depending on model and axis, so a case that looks big enough can still be too small.
2. Sizing for the drone and forgetting the controller. The RC 2 is wider than a folded Mini.
3. Packing wet. A sealed case keeps humidity in. Dry the drone after a damp flight and add fresh silica gel.
4. Leaving batteries in a checked case. Spares go in the cabin.

Frequently asked questions

Does a DJI Mini 4 Pro fit in a Vantage 225?
The drone and a row of batteries will fit: the 225 is 300 x 225 x 132 mm inside and the folded Mini 4 Pro is 148 x 94 x 64 mm. The RC 2 will not fit beside it with 20 mm of foam around both, so for drone plus controller choose the Vantage 270S.

Is a Mini 3 case the same as a Mini 4 Pro case?
Almost. DJI lists the Mini 3 at 148 x 90 x 62 mm folded and the Mini 4 Pro at 148 x 94 x 64 mm. Cut the pocket for the larger drone and both will sit snugly.

Can I keep batteries inside the drone case on a flight?
Only if the case travels in the cabin. Spare lithium batteries are not allowed in checked baggage under IATA guidance.

Will the case keep my drone dry in the monsoon?
Yes, with the lid closed, latches locked and a clean seal. IP67 means dust-tight and protected against immersion to 1 metre for 30 minutes. Wipe grit off the gasket before you close it.

For the full picture on choosing a case, read the hard case for camera buying guide, or browse all fifteen waterproof hard cases. For a Mini series kit, start with the Vantage 270S.