Kokudankokuya — bottle size as a variant, not a second product
The same fragrance sells in several bottle sizes — opening each size as its own product bloats the catalogue with repetition, while collapsing them into one loses stock and pricing per size. We set the variant boundary at size: the fragrance stays a single product record, price and stock hang off the size, and adding a size does not add a product. Fragrance family and notes sit beside the category tree as a second navigation axis, so a buyer who does not know the brand name starts from the character and arrives at the product.
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