Il cassone contiene l'indifferenziato.

Cassone literally means a large container, bin, skip, or dumpster-like container, depending on context.

In everyday Italian about trash, you may also hear:

• bidone = a bin, can, or drum
• cassonetto = a street trash container / dumpster
• cassone = often a larger container than a normal household bin

So cassone suggests something fairly big. The exact English translation depends on the situation.

Because cassone is a masculine singular noun.

So it takes the masculine singular definite article il:

• il cassone = the container/bin

If it were plural, it would become:

• i cassoni = the containers

Contiene is the 3rd person singular present tense of contenere = to contain.

So:

• io contengo = I contain
• tu contieni = you contain
• lui/lei contiene = he/she/it contains

Here the subject is il cassone, which is singular, so contiene is the correct form:

• Il cassone contiene... = The container contains...

Because indifferenziato begins with a vowel sound, and in Italian il becomes l' before most singular masculine nouns beginning with a vowel.

So:

• il libro
• il cassone
• but l'indifferenziato

This is called elision.

Yes. Indifferenziato is originally an adjective meaning undifferentiated or unsorted.

But in this context, Italian commonly uses it as a noun:

• l'indifferenziato = unsorted waste / general waste / residual waste

This is very common in recycling and trash vocabulary. Italian often turns adjectives into nouns when the meaning is understood from context.

A similar idea in English would be something like:

• the unemployed
• the unknown

So here l'indifferenziato means the unsorted trash, not just the adjective unsorted by itself.

Italian uses definite articles more often than English does.

So where English may say:

• contains unsorted waste

Italian very naturally says:

• contiene l'indifferenziato

In waste-sorting language, l'indifferenziato refers to the whole category of that kind of trash, so the article sounds normal.

Yes, pretty much. It follows the normal pattern:

• Il cassone = subject
• contiene = verb
• l'indifferenziato = direct object

So it is a straightforward Subject + Verb + Object sentence:

• The container contains the unsorted waste

Italian often uses this same basic order.

A rough pronunciation guide is:

leen-deef-fe-ren-tsya-to

More carefully, the stress falls on -zia-:

in-dif-fe-ren-zià-to

A few helpful points:

• gli is not present here, so nothing tricky there
• z in -ziato is pronounced like ts
• the apostrophe in l'indifferenziato does not create a pause; you say it smoothly

Not usually, if you want to express what the container is meant to hold.

Contenere is better because it means to contain and sounds more natural in descriptions, labels, or instructions.

• Il cassone contiene l'indifferenziato = the container contains / is for unsorted waste

Avere (to have) is grammatically possible in some contexts, but it sounds less precise here.

Yes. It sounds like something you might read on:

• a waste-sorting sign
• a recycling instruction
• a municipal notice
• a label on a large trash container

In very practical Italian, especially in public signage, nouns like l'indifferenziato, la plastica, la carta, and l'umido are extremely common to indicate what goes in each container.