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You've ordered a 15ml CBD vape juice refill, looked at the bottle, and noticed a small empty area between the liquid and the top of the container. The obvious question is: if the label says 15ml, why isn't the bottle filled all the way to the top?
The answer starts with an important packaging concept called headspace. In liquid packaging, the quantity associated with a product and the absolute maximum amount its container could physically hold aren't necessarily the same thing. Packaging terminology distinguishes the normal or nominal fill from brimful or overflow capacity, which describes the volume a container holds when filled to overflowing. The space between the designed fill level and the top or seal area is generally called headspace.
That means a visible gap at the top of a bottle does not, by itself, prove that a product is underfilled. Bottle geometry, the intended fill level, closure design, packaging specifications, and the actual measured net contents all matter. Let's break down why.
