Map the Spray-Head Envelope
The top of a room spray bottle is usually more sensitive than the bottle body. A carton can look correctly sized around the glass and still press against the actuator, cap or collar every time the top flap closes. Custom Room Spray Boxes should therefore be planned from the highest finished point of the spray mechanism downwards, not simply from the nominal bottle volume.
That matters because a 100 ml bottle does not have one standard external shape. Different shoulders, pumps, caps and collars can change the real packed height and the amount of free space required above the product.
Measure the Closure in Its Selling State
Measure the bottle exactly as it enters the carton. If it is sold with a dust cap, include the cap. If the actuator remains exposed, measure the highest part of the pump and note whether pressing it could trigger the spray.
Do not rely only on a glass supplier's bottle dimensions. The pump assembly may add several millimetres above the neck, while a cap can also be wider than the bottle shoulder.
The sizing principles in what size tuck box do I need are useful here because caps, pumps, inserts and other components all belong in the final packed measurement.
Leave Headspace Without Creating Lift
Top clearance should prevent pressure on the spray mechanism, but excessive headroom creates another problem. A tall bottle can rise and fall inside the carton when it is tilted or handled.
If the product moves vertically, control that movement with the carton depth or a deliberate internal feature rather than filling the top with loose material. The objective is a bottle that remains stable while the pump stays unloaded.











