How to Say "bulk" in Spanish
The most common Spanish word for “bulk” is “cantidades” — use 'cantidades' when referring to buying, selling, or dealing with large numbers or amounts of something, like products or supplies..
cantidades
/kan-tee-DAH-dehs//kantiˈdaðes/

Examples
Compramos el material en grandes cantidades para ahorrar dinero.
We buy the material in large quantities to save money.
Necesitamos grandes cantidades de papel para la oficina.
We need large amounts of paper for the office.
Hay pequeñas cantidades de azúcar en la leche.
There are small quantities of sugar in the milk.
Compramos la harina en cantidades industriales.
We buy the flour in industrial quantities.
Using the word 'of'
Just like in English, when you use this word, you usually follow it with 'de' (of) to say what you are measuring, such as 'cantidades de dinero' (amounts of money).
The 'Always Feminine' Rule
Mistake: “Using 'los cantidades' when talking about masculine items.”
Correction: Always use 'las' or 'unas' with this word, even if the item itself is masculine. Say 'las cantidades de arroz,' not 'los cantidades de arroz.'
masa
MAH-sah/ˈma.sa/

Examples
La masa de esta roca es impresionante.
The mass of this rock is impressive.
La masa de un objeto no cambia, sin importar dónde se encuentre.
The mass of an object does not change, regardless of where it is located.
Hay una gran masa de hielo flotando en el océano.
There is a large mass of ice floating in the ocean.
Masa vs. Peso
In science, 'masa' is the amount of matter in something, while 'peso' (weight) is the force of gravity pulling on that matter. In everyday Spanish, people often use 'peso' when they mean 'masa' (like asking '¿cuánto pesa?' instead of '¿cuál es su masa?').
Quantities vs. Physical Mass
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