How to Say "carton" in Spanish
The Spanish word for “carton” is “caja” — A1 level. This is a very common word in everyday Spanish.

Examples
Puse los libros viejos en una caja de cartón.
I put the old books in a cardboard box.
Mi gata le encanta dormir dentro de las cajas.
My cat loves to sleep inside boxes.
¿Puedes traerme una caja de leche del supermercado?
Can you bring me a carton of milk from the supermarket?
Always Feminine: 'La Caja'
Remember that 'caja' is a feminine word, so you always use 'la' or 'una' with it. For example, 'la caja grande' (the big box), not 'el caja grande'.
'Caja' vs. 'Cajón'
Mistake: “Puse mis calcetines en la caja.”
Correction: Puse mis calcetines en el cajón. Use 'caja' for a separate, movable box and 'cajón' for a drawer that's part of a piece of furniture like a dresser.
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