Necks and closures
On this page9
The necks
24-410 at 277, 38-400 at 146, 20-410 at 124, 20-400 at 72, 28-410 at 66, 45-400 at 62. The 410 finishes are sprayer and pump territory; 38-400 and 45-400 are where the larger containers sit.
The closures
230 continuous thread, 43 dropper assemblies, 34 fine mist sprayers, 31 lotion pumps, 19 trigger sprayers, 14 treatment pumps, 14 phenolic and 9 dome lids.
The imbalance is the useful fact
Nearly every dispensing closure here serves the small half. The bulk half is served by continuous thread caps, which is what the category uses, but it means a bulk product does not get to choose between four ways of pouring.
Liners carry the chemical load
A detergent sits against the liner inside the cap for months. That is a different material from the bottle and it is the one that fails first, so it belongs in the specification rather than being accepted as supplied.
Child resistant options are per finish
If the free alkali calculation requires one, the question becomes which finishes carry a child resistant closure, and the container is chosen from those. That ordering is not negotiable once the requirement exists.
Test the seal on its side, warm
A laundry product travels in a box and sits in a cupboard. A cap that seals on a bench at room temperature and leaks at 90F on its side is the most common packaging complaint in the category.
And test the pour with the real product
Viscosity decides whether a given neck glugs, drips or runs clean. Water in the bottle tells you about water. Use the formula.
Stay on a populated finish
The six finishes above carry almost the whole shelf between them. A container on one of those can change closure later without changing bottle; a container on a finish with two options cannot, and that only becomes visible at the moment you need to change something.