Three numbers describe most packaging: capacity (how much it holds), dimensions (how big it is), and neck finish (how closures fit). They are related but not interchangeable, and confusing them is a common cause of parts that do not fit or bottles that look wrong on shelf. This guide explains each and how they work together, so you can brief a supplier accurately.
Capacity: fill volume versus stated size
Capacity is how much product a container holds. A "50ml" bottle usually refers to its nominal product fill, but the brimful volume is higher to leave headspace for the closure, dip tube and the way the product settles. When you specify size, be clear whether you mean the labelled fill or the brimful capacity, and confirm the real fill with your actual formula, since thick or foaming products behave differently.
APG lists capacities across its ranges; the airless collection, for example, spans compact sizes through larger bottles, with many components offered in several capacities on the same structure.
Dimensions: height, diameter and shelf fit
Dimensions are the physical measurements, typically height by diameter. They matter for more than looks: they affect how the product sits on a shelf or in a carton, how it photographs for e-commerce, and whether it fits a secondary pack. Two bottles can share a capacity yet look very different, one tall and slim, the other short and wide.
As a concrete reference, APG's "A Touch of Grace" airless treatment pump bottle is listed at 97.2 × 36.7mm for the 15ml size and 164.9 × 36.7mm for the 50ml, showing how height grows while diameter stays constant across a family. Use real dimensions, not just capacity, when you plan cartons and displays.
Neck finish: how closures fit
The neck finish decides whether a pump, cap or sprayer will thread on and seal. It is written as two numbers, such as 24/410:
- The first number identifies the nominal outside diameter of the neck finish in millimetres; actual dimensions and tolerances come from the drawing.
- The second number identifies the finish series, which specifies details such as the thread and finish geometry. It is not a measurement in millimetres.
So a 24/400 and a 24/410 share a diameter but differ in thread height, and a closure made for one may not seal correctly on the other even if it threads partway. Some sprayers use a ratchet finish with a locking feature instead of a standard continuous thread. Always match both numbers, and confirm against your bottle drawing.
How the three fit together
| Spec | What it controls | How to confirm |
|---|---|---|
| Capacity | Product fill and headspace | Test fill with your real formula |
| Dimensions | Shelf, carton and photo fit | Use height × diameter from the drawing |
| Neck finish | Closure fit and seal | Match both numbers to the bottle drawing |
Measuring a sample you already have
If you only have a physical bottle, record its overall dimensions and measure across the outside of the threads as a starting point. Photograph the neck and note any ratchet or locking feature. These observations help a supplier identify the finish, but counting thread turns alone is not a reliable identification method. Send a sample or a technical drawing so the neck, sealing surface and dip-tube fit can be checked together.
Next step with APG
APG manufactures bottles, jars and tubes in a wide range of capacities, dimensions and neck finishes, with matching pumps, sprayers and caps. If you share your target fill, preferred proportions and the neck finish on your bottle, the team can confirm compatible components and discuss samples and testing requirements. Confirm the minimum order quantity for your component and decoration. Request a quote and include your capacity and neck finish.