Views: 12 Author: Site Editor Publish Time: 2026-08-24 Origin: Site
A common flight case buying mistake starts with a perfectly reasonable thought:
“My equipment is 600 × 400 × 200 mm, so I need a 600 × 400 × 200 mm case.”
Usually, that is not enough information.
The equipment may technically measure:
600 × 400 × 200 mm
(23.6 × 15.7 × 7.9 in)
but the usable inside of the flight case may also need room for:
foam;
handles or knobs;
connectors;
cables;
removable accessories;
space to insert and remove the equipment.
At the same time, the outside of the case will be larger again because the case itself has:
panels;
profiles;
corners;
latches;
handles;
wheels.
So there are actually three different measurements to think about:
EQUIPMENT SIZE → REQUIRED INTERNAL SIZE → FINAL EXTERNAL SIZE
Confusing these three is one of the easiest ways to buy the wrong flight case.
If you are choosing a case for existing equipment:
Measure the maximum:
Length × Width × Height
including protruding parts.
The inside of the case must accommodate:
equipment + protection + practical clearance
External dimensions matter when you need to know whether the complete case will fit:
your van;
truck;
warehouse shelf;
doorway;
shipping limit.
For fit compatibility, internal dimensions come first.
For transport and storage planning, external dimensions also matter.
You can compare available Flight Cases, but always confirm whether a listed size refers to internal or external dimensions before ordering.
When measuring equipment, measure the actual maximum physical dimensions.
Do not measure only the main rectangular body.
For example, equipment may have:
handles;
connectors;
knobs;
antenna sockets;
brackets;
feet;
wheels;
control panels.
If any part extends beyond the main body, include it.
Suppose the main body of a mixer is:
600 × 400 × 180 mm
(23.6 × 15.7 × 7.1 in)
But the rear connectors extend another:
20 mm (0.8 in)
Then the real maximum depth is not:
400 mm
It may be:
420 mm (16.5 in)
That is the measurement that matters.
A case that fits the aluminum chassis but crushes the connector area is not the correct case.
Use this basic rule:
Measure from the furthest point on one side to the furthest point on the opposite side.
For rectangular equipment, this is straightforward.
For irregular equipment, it becomes more important.
Measure:
maximum left-to-right width;
maximum front-to-back depth;
maximum height including knobs or controls.
If the controller has:
feet;
handles;
cable ports;
include them where relevant.
A moving head is more complicated.
The base may be narrow, while the head is wider.
You should not measure only the base.
Check:
base width;
maximum head width;
overall height;
any protruding mounting points.
The case must accommodate the whole fixture, not only the part sitting on the bottom.
The internal dimensions describe the usable space inside the flight case.
This is the measurement you should compare with the equipment.
Suppose a case is listed as:
Internal size: 650 × 450 × 250 mm
(25.6 × 17.7 × 9.8 in)
and your equipment is:
600 × 400 × 200 mm
(23.6 × 15.7 × 7.9 in)
At first glance, there is:
50 mm extra length;
50 mm extra width;
50 mm extra height.
But that does not automatically mean the case is correct.
You still need to ask:
How will that extra space be used?
This is the most important principle.
A useful way to think about it is:
Required Internal Size = Equipment Size + Protection Allowance + Practical Clearance
The exact allowance depends on the equipment.
There is no single universal number that should be added to every case.
Because different equipment has different needs.
For example:
May tolerate a relatively simple fit.
May need more carefully positioned internal protection.
May need top clearance around controls.
May require space for:
connectors;
power cables;
operating access.
So do not use a fixed rule such as:
“Always add 50 mm.”
That may work in one situation and be wrong in another.
Foam takes up internal space.
If you want foam around the equipment, that foam must fit between:
equipment surface ↔ case wall
For example, imagine:
Equipment width:
600 mm (23.6 in)
If the internal protection design requires space on both sides, the inside of the case must be wider than 600 mm.
That sounds obvious, but buyers frequently compare:
equipment width = case internal width
and forget that there is nowhere left for cushioning.
More foam also means:
larger case;
heavier case;
more storage volume.
The objective is not to create the thickest possible cushion.
The objective is:
Enough protection for the equipment and transport situation.
Height is especially easy to measure incorrectly.
For equipment with:
knobs;
faders;
screens;
antennas;
moving components;
the highest point may be vulnerable.
A lid that presses against:
knobs;
sliders;
display screens;
can create damage even though the case technically closes.
So when measuring height, ask:
Does the lid need clearance above this part?
This is especially important for DJ controllers, mixers and consoles.
Another important question is:
Will the equipment be transported with cables disconnected, or used while still inside the case?
These are different case requirements.
Workflow:
open → remove equipment → connect cables → use
In this situation, you may not need much extra cable clearance inside the case.
Workflow:
open lid → connect cables → operate equipment inside the case
Now you may need additional space around:
rear connectors;
power plugs;
signal cables;
side connections.
A case that fits the equipment perfectly may still be unusable if you cannot connect the cables.
External dimensions describe the complete outside size of the flight case.
They include the structure of the case itself.
Depending on the design, this may include:
case panels;
aluminum profiles;
corners;
handles;
latches;
wheels.
Therefore:
Internal 600 mm does not mean External 600 mm.
The outside will be larger.
External dimensions become important when planning:
Will the case fit:
in a van;
under a shelf;
between other cases?
Can you actually roll the case into the venue?
Will it fit the rack or storage position?
External dimensions affect:
package volume;
shipping cost;
dimensional weight.
A perfectly fitted equipment case can still create operational problems if the finished outside dimensions are too large for your transport system.
When checking external size, remember wheels.
Suppose the case body is:
800 mm (31.5 in) high.
After adding casters, the total height may become greater.
If your storage shelf or vehicle clearance is limited, this matters.
Therefore ask the supplier whether the stated external height:
includes wheels;
excludes wheels.
Do not assume.
A recessed handle may sit relatively flush.
Another hardware arrangement may protrude further.
So if the case must fit through:
a narrow doorway;
truck opening;
storage slot;
ask for the maximum external dimension, not only the nominal box dimension.
Suppose you have a DJ controller measuring:
700 × 400 × 100 mm
(27.6 × 15.7 × 3.9 in)
You should not immediately search for:
700 × 400 × 100 mm flight case
Instead:
Check:
knobs;
connectors;
feet;
handles.
Assume the real maximum remains:
700 × 400 × 100 mm
Will it:
or
If B:
rear and side cable access may increase the required internal space.
Determine how much space is needed for:
base cushioning;
side protection;
lid protection.
Only now should you select the case internal dimensions.
Finally confirm whether the complete case fits your:
vehicle;
storage;
venue access.
This order prevents many sizing mistakes.
Some equipment cannot be described accurately using only three numbers.
Examples:
moving heads;
unusual speakers;
specialized AV devices;
custom electronics.
For these products:
Length × Width × Height
is still useful, but may not be enough.
Send:
front photo;
side photo;
top photo;
maximum measurements;
equipment model.
If needed, mark important dimensions directly on the photo.
Another common mistake is trying to estimate size visually.
For example:
“This mixer looks about the same size as mine.”
That is not reliable.
Equipment that looks similar can differ by:
20 mm;
50 mm;
100 mm;
and that difference may determine whether the case fits.
Use:
manufacturer dimensions;
your own measurements;
not appearance alone.
If the equipment manufacturer's specification gives dimensions, verify whether those numbers include:
handles;
feet;
brackets;
detachable parts.
Sometimes a published product dimension describes the main body.
Sometimes it gives the maximum overall size.
If compatibility is important and the difference is small:
Measure the actual equipment.
That is safer than assuming.
Once you know the required internal dimensions, the next decision becomes easier.
An existing case provides:
enough internal space;
appropriate protection;
practical clearance;
without being unnecessarily oversized.
You can compare available Flight Cases first.
You cannot get a reasonable fit because:
the equipment shape is unusual;
standard cases leave too much unused space;
a standard case is too tight;
special foam positioning is required;
cables must remain connected;
several devices must fit together;
internal compartments are required.
For unusual applications, you can also review our Custom Case examples and send us the actual equipment dimensions for confirmation.
The principle is:
Use a standard case when it works. Customize only when the equipment creates a real reason to customize.
Wrong comparison:
Equipment size ↔ external case size
Correct comparison:
Equipment size ↔ usable internal case size
This may leave no room for:
foam;
clearance;
protruding parts.
Do not forget:
handles;
connectors;
knobs;
feet;
brackets.
Especially important when equipment remains inside the case during use.
Too much empty space can mean:
more movement;
larger external size;
more weight;
more shipping volume.
The objective is a controlled fit, not the biggest box available.
This can create problems with:
vehicle loading;
storage racks;
venue entrances.
If you are unsure which case fits, send:
Equipment brand and model
Maximum length
Maximum width
Maximum height
Equipment weight
Photos from front, side and top
Location of protruding parts
Whether the equipment stays inside the case during use
Whether cables must remain connected
How many units you want in one case
For dimensions that materially affect the case, metric is preferred, but imperial is also fine.
Example:
762 × 508 × 305 mm
(30 × 20 × 12 in)
Before ordering, confirm:
Equipment size
→ Have I measured the maximum physical dimensions?
Internal size
→ Is there enough room for protection and clearance?
Operating space
→ Can cables and controls still be used if the equipment stays inside?
External size
→ Will the complete case fit my vehicle and storage?
Loaded weight
→ Can my crew actually move it?
Compatibility
→ Am I buying from measurements, not appearance?
If all six answers are clear, the chance of buying the wrong case drops significantly.
When choosing a flight case, do not think:
“My equipment is 600 mm wide, so I need a 600 mm case.”
Think:
**Equipment dimensions
protection
working clearance
= required internal dimensions**
Then check:
**required internal dimensions
case construction
hardware / wheels
= final external dimensions**
That distinction is the foundation of correct flight case sizing.
Start by comparing standard Flight Cases.
If an existing SKU provides the correct internal space, use the standard case.
If no standard case provides a reasonable fit, send us the equipment measurements and photos rather than choosing a case that is merely “close enough.”
Usually not.
The case may also need space for:
foam;
protruding parts;
insertion and removal;
cable clearance.
The correct allowance depends on the equipment and case design.
Internal dimensions describe the usable space available for the equipment.
External dimensions describe the overall finished size of the case.
Use internal dimensions to check fit.
Use external dimensions to check transport, storage and shipping.
There is no universal allowance.
It depends on:
equipment shape;
protection method;
vulnerable components;
operating requirements.
Do not simply add the same number to every equipment type.
Yes.
Measure the maximum physical dimensions, including any fixed protruding parts that must remain attached during transport.
They may affect the total external height.
Always confirm whether the published dimensions include or exclude casters.
Manufacturer dimensions are useful, but confirm what they include.
If the fit is close, measure the actual equipment.
Send:
measurements;
equipment model;
photos from several directions.
A custom internal layout may be more appropriate if a standard rectangular case cannot protect the equipment properly.
