Blackcurrants (and all types of currants in general) are usually sold in transparent plastic baskets containing 200 grams, with an articulated cover and an absorbent paper in the base, placed to soak up the liquid that could be released by the product and orifices for air circulation.
It is marketed in very peculiar small trays that enable them to be served in the table without removing them from the package. There are also baskets of 125 g for a cheaper price.