L'organico va nel sacchetto compostabile.

L' is the shortened form of the definite article lo here.

Normally, masculine singular nouns can take:

• il
• lo
• or a shortened form before a vowel

Because organico starts with a vowel, Italian uses elision:

• lo organico → l'organico

So l'organico means the organic waste.

In everyday Italian, especially in recycling and trash-sorting contexts, l'organico is a noun that means organic waste / food waste.

So although organico can be an adjective meaning organic, here it is being used as a noun.

Very common waste-sorting categories include:

• la carta = paper
• la plastica = plastic
• il vetro = glass
• l'organico = organic waste

Yes, va literally comes from andare = to go, and va means goes.

But in sentences like this, Italian often uses andare in a practical, instructional sense:

• L'organico va nel sacchetto compostabile.

This means something like:

• Organic waste goes in the compostable bag
• Organic waste should be put in the compostable bag
• Organic waste belongs in the compostable bag

So it is not mainly about movement in the literal sense. It is a common way to give sorting instructions.

Because nel is the contracted form of:

• in + il = nel

Italian often combines prepositions with definite articles.

Examples:

• in + il = nel
• in + la = nella
• in + lo = nello
• in + i = nei
• in + gli = negli
• in + le = nelle

So:

• nel sacchetto = in the bag

Using nel = in the makes the sentence sound like it is referring to the expected or designated bag for that purpose.

So:

• nel sacchetto compostabile = in the compostable bag

This is natural when talking about a known category or standard household recycling setup.

If you said:

• in un sacchetto compostabile

that would mean:

• in a compostable bag

That is also grammatically correct, but it sounds less specific.

In Italian, adjectives often come after the noun, especially when they are classifying or describing the type of thing.

So:

• sacchetto compostabile = compostable bag

This is the most normal order here.

In English, adjectives usually come before the noun:

• compostable bag

In Italian, post-noun position is very common:

• un sacchetto compostabile
• una bottiglia di plastica
• un contenitore verde

Yes, sacchetto means bag, usually a small bag or sack.

It often refers to the kind of bag used for groceries, trash, or food scraps.

Compared with some other Italian words:

• sacchetto = bag, small sack
• borsa = bag, purse, shopping bag
• sacco = sack, large bag

In a recycling context, sacchetto is exactly the kind of word you would expect.

Not exactly.

• compostabile = compostable
• biodegradabile = biodegradable

Something compostabile is designed to break down in composting conditions.
Something biodegradabile can break down naturally, but not necessarily in the same way or under the same conditions required for composting.

In waste-sorting instructions, compostabile is the more precise word if the bag is meant for organic waste collection.

Italian often leaves that idea implied.

In English, we might say:

• Organic waste should go in the compostable bag

Italian can express the same idea simply with:

• L'organico va nel sacchetto compostabile.

Here, va naturally carries the idea of:

• goes
• belongs
• should be put

This is very common in instructions, rules, and labels.

Yes. In many places in Italy, people also use l'umido to refer to food waste / wet organic waste.

So depending on the region or the local waste system, you may hear:

• l'organico
• l'umido

They often overlap in meaning in everyday recycling language, though organico is a bit more general and explicit.

A simple pronunciation guide is:

lor-GA-ni-ko va nel sak-KET-to kom-pos-TA-bi-le

A few helpful notes:

• L'organico is pronounced smoothly, almost like one word.
• c before h, a, o, u is a hard k sound, so compostabile starts with kom-.
• cche in words like sacchetto gives a hard k sound: sak-KET-to.

Yes, but the original order is the most natural and standard for a neutral statement.

Normal:

• L'organico va nel sacchetto compostabile.

You could change the order for emphasis, but that is less basic and less common for a learner:

• Nel sacchetto compostabile va l'organico.

That version emphasizes where it goes.
For everyday learning and normal instructions, stick with:

• L'organico va nel sacchetto compostabile.