Όσο κι αν γεμίσει ο κάδος συλλογής ρούχων, αδειάζεται.

It means no matter how much or however much.

This pattern introduces a concessive idea: even if something happens to a great degree, the main statement is still true.

So:

• Όσο κι αν γεμίσει... = No matter how much it fills up...
• or more naturally in English here: No matter how full it gets...

κι is just a shorter form of και. It is very common before a vowel and in natural flowing Greek.

So:

• κι αν
• και αν

mean the same thing here.

In this expression, κι helps give the sense of even or no matter.

Here γεμίσει is not past tense.

It is the form used after αν, often called the aorist subjunctive or perfective non-past of γεμίζω.

So in this sentence, γεμίσει means something like:

• fills up
• gets full
• may fill up

not filled up.

This is a very common thing in Greek: a form that looks past-like to English learners is often not past at all when it appears after words like αν.

This is a question of aspect.

• γεμίσει presents the action as a whole, with an endpoint: fill up / reach fullness
• γεμίζει presents it as ongoing or repeated: is filling / fills

In this sentence, γεμίσει fits well because the idea is:

• however full it gets
• no matter how much it fills up

So the sentence focuses on the result or extent of filling, not on the process itself.

Word by word:

• ο κάδος = the bin / container
• συλλογής = of collection
• ρούχων = of clothes

So literally it is:

• the bin of collection of clothes

But natural English would be:

• the clothes collection bin
• the clothing collection bin
• the clothing donation bin

Because Greek often uses the genitive to connect nouns the way English uses:

• of
• or noun modifiers such as clothes collection bin

So:

• συλλογής = of collection
• ρούχων = of clothes

Together, συλλογής ρούχων means for the collection of clothes or of clothes collection in a literal sense.

This is a very common Greek way to build compact noun phrases.

Because this phrase works like a compact label or description.

Greek often leaves out extra articles in expressions like this when the nouns are functioning as modifiers:

• ο κάδος συλλογής ρούχων

This sounds natural and compact, like a category or sign.

If you said ο κάδος της συλλογής των ρούχων, it would sound much more specific and heavier, more like the bin of the collection of the clothes, which is usually not what is meant here.

αδειάζεται is the present passive form of αδειάζω.

Here it means:

• is emptied
• gets emptied

It describes an action done to the bin.

It does not mean simply is empty.
For that, Greek would use something like:

• είναι άδειος = it is empty

So:

• αδειάζεται = someone empties it / it gets emptied
• είναι άδειος = it is empty

Because the sentence focuses on the bin, not on the person or service doing the emptying.

Greek often uses the passive, just like English, when the agent is:

• unknown
• obvious
• unimportant
• not the main point

So the idea is:

• the bin gets emptied

rather than:

• someone empties the bin

The present tense here expresses a general rule, habitual action, or regular practice.

The sentence is not describing one single event. It means something like:

• Whenever it gets full, it is emptied
• No matter how full it gets, it gets emptied

So the present is being used for something that happens regularly.

Yes. The comma separates the first clause from the main clause:

• Όσο κι αν γεμίσει ο κάδος συλλογής ρούχων,
• αδειάζεται.

This is similar to English punctuation in a sentence like:

• No matter how full the bin gets, it is emptied.

The comma helps show that the first part sets up the condition or concession, and the second part gives the main statement.

Yes. Greek word order is fairly flexible.

The original order is natural because it first introduces the no matter how... idea and then gives the result:

• Όσο κι αν γεμίσει ο κάδος συλλογής ρούχων, αδειάζεται.

That final αδειάζεται gets a bit of emphasis this way.

So while Greek can often rearrange elements, this version is neat and natural for the meaning intended.