The machine is chosen by output and container size, not by what goes in the bottle — but the sizes cluster by industry, which is usually where the conversation starts.
The largest single use of these machines, and the one where cost per bottle decides everything.
Heavier wall sections and larger containers; the 2-cavity machines are built for this range.
Small formats, tight tolerance on neck finish and fill height, frequent SKU changes.
Detergents, floor cleaners and personal care — handles, triggers and shaped containers.
Measured-dose containers with a graduation panel, often in a fixed set of sizes.