Sizes, and the pack
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The distribution of sizes
Of the 224 containers, 38 are under 60 ml, 53 between 60 and 120, 70 between 120 and 250, and 63 at 250 ml and above. So the shelf is genuinely usable at single-melt, multi-melt and bulk sizes.
The single scent shot
Small, wide and shallow, bought as a sampler or an add-on. The lower end of the shelf suits it and the label space is tight, which is where the type-size arithmetic starts to matter.
The multi-melt cup
One container holding several portions, which is the simplest format to label because it is one package with one weight. It is also the easiest to get right on release if the container tapers.
The multiunit pack
Two or more individually packaged units of the same commodity in the same quantity. Its declaration states the number of units, the quantity of each and the total, with the rule’s own example reading "6 Bars, Net Wt. 3.4 ozs. (96.3 g) each, Total Net Wt. 1 lb. 4.4 oz. (578 g)".
And if the inner units are sold separately
They each have to comply with part 500 in their own right. If they are not sold separately, the outer package may instead declare only the total. Deciding which you are doing changes the print job, so decide it first.
Cost the pack, not the jar
Filling, labeling and shipping are close to flat per unit, so small formats carry more packaging cost per ounce of wax. At these sizes the container is a real share of the price and the arithmetic is worth doing per format.
Decide the format before the first label order
Single cup, multi-melt cup and multiunit pack have three different declarations, and labels are bought in quantity. Settling the format first is what stops a correct label becoming the wrong label.