La palabra del día: Mercancía

Feminine noun. Usually in singular. Movable thing that is the object of trade or sale. E.g.: Forma de envío – ¿cómo es despachada mi mercancía?: Mode of despatch – how will my products be forwarded?.
Even if this noun is used as a singular, it can refer to a plural concept; for example, several boxes of cigarettes can be called simply mercancía. I would recommend to use it as a singular noun if the goods are all the same, all cigaretes, but if the goods are cigarettes and chocolates, I think it is more appropriate to call them mercancías, although, the singular form is still valid. dc