Sizes and necks, and the shipping limit
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The range
Seven to 120 mL across 63 containers. That is a fragrance range: a sample, a travel size, a standard bottle and a large one. Nothing on this shelf is bulk, and nothing needs to be.
Every size clears the inner limits comfortably
The limited quantity inner packaging limit is 0.5 L for Packing Group I and 1.0 L for Packing Group II. A 120 mL bottle is well under either, so the constraint that bites is the 30 kg gross package weight rather than the bottle size.
Which makes the case the thing to watch
Glass is heavy, and a case of 120 mL bottles with a strong outer packaging approaches 30 kg faster than a case of 30 mL ones. Case quantity is therefore a shipping decision as well as a commercial one.
The sample size earns its keep here
Fragrance is bought after trying, more than almost any other category, and the bottom of this range supports that. The label content is modest compared with a drug or a food product, so a small panel is workable.
Necks, and the one to build on
20-400 at 31 containers is the dominant finish, with 24-400 at 8 and 38-400 at 5. Standardizing a range on one finish buys one sprayer in volume, and on this shelf that decision interacts with the sprayer availability.
So choose the pair, then the sizes
Bottle finish and fitment together, then the sizes in that finish. Doing it the other way round produces a range that needs two or three different sprayers for no benefit anyone can see.
Cost the bottle as a bottle
Filling, labeling, the sprayer and the outer packaging are close to flat per unit, so a 10 mL sample carries far more of each per milliliter than a 100 mL bottle. Decide what each format has to earn.