يحزم صديقي المرتبة الهوائية وكيس النوم.

This is a very common Arabic word order: verb + subject + object.

So:

• يحزم = packs
• صديقي = my friend
• المرتبة الهوائية وكيس النوم = the air mattress and the sleeping bag

In English, we usually prefer subject + verb + object: My friend packs...

In Arabic, both orders are possible:

• يحزم صديقي المرتبة الهوائية وكيس النوم = verb-first
• صديقي يحزم المرتبة الهوائية وكيس النوم = subject-first

Both are correct, but the verb-first pattern is very common in Modern Standard Arabic.

يحزم is the present tense / imperfect form of the verb حزم.

It means he packs or he is packing, depending on context.

Breakdown:

• حزم = to pack
• يحزم = he packs / he is packing

Arabic present-tense verbs often begin with a prefix. Here, يـ signals he.

So يحزم specifically means he packs.

صديقي means my friend.

It is made of:

• صديق = friend
• ـي = my

So:

• صديق = a friend / friend
• صديقي = my friend

This ـي is a possessive suffix. It attaches directly to the noun.

In Arabic verbal sentences, the subject often comes after the verb.

We know صديقي is the subject because it is the person doing the action of packing.

So in:

• يحزم صديقي...

the one who is packing is my friend.

Also, in a full grammatical analysis, صديقي is in the nominative case as the subject, even though the short vowel ending is not usually written in normal Arabic text.

المرتبة الهوائية literally means something like the air mattress or the pneumatic mattress, but in natural English it is usually the air mattress or the inflatable mattress.

Breakdown:

• مرتبة = mattress
• هوائية = air / aerial / pneumatic

The adjective هوائية follows the noun and agrees with it.

Because المرتبة is definite with الـ, the adjective must also be definite:

• مرتبة هوائية = an air mattress
• المرتبة الهوائية = the air mattress

This is a key Arabic rule: adjectives usually match the noun in:

• definiteness
• gender
• number
• case

Because it describes مرتبة, and مرتبة is a feminine noun.

In Arabic, adjectives must agree with the noun they describe. Since مرتبة is feminine singular, the adjective must also be feminine singular:

• مرتبة = feminine singular
• هوائية = feminine singular adjective

That is why you see the ـة ending on هوائية.

This is an iḍāfa construction, often called a genitive construction or noun annexation.

كيس النوم literally means bag of sleep, but naturally it means sleeping bag.

In an iḍāfa:

• the first noun does not take الـ
• the second noun tells you what kind of thing it is or what it belongs to

So:

• كيس النوم = the sleeping bag
• not الكيس النوم

That is because in iḍāfa, the first noun normally does not take الـ.

Because in an iḍāfa construction, the definiteness of the whole phrase depends on the second noun.

Here:

• النوم = the sleep / sleeping
• since the second noun is definite, the whole phrase becomes definite

So:

• كيس نوم = a sleeping bag
• كيس النوم = the sleeping bag

Even though كيس itself does not have الـ, the whole expression can still be definite.

Yes, literally النوم means the sleep or sleeping, but in expressions like كيس النوم, Arabic often uses a definite second noun in an iḍāfa to form a standard lexical phrase.

So even though the literal structure is bag of the sleep, the natural meaning is simply sleeping bag.

This is one of those places where Arabic structure and English structure do not match word-for-word.

Because only the last two objects are being joined.

The sentence has one verb and one subject, followed by two objects:

• المرتبة الهوائية
• كيس النوم

Arabic uses و to mean and between the two nouns:

• المرتبة الهوائية وكيس النوم = the air mattress and the sleeping bag

That is exactly like English: you do not put and before the first item in a simple pair.

A fully vocalized version would be:

يَحْزِمُ صَديقي المَرْتَبَةَ الهَوائِيَّةَ وَكيسَ النَّوْمِ

The main endings are:

• يَحْزِمُ → ـُ because it is a present-tense verb
• صديقي → subject, so nominative
• المرتبةَ → direct object, so accusative
• الهوائيةَ → adjective matching المرتبة, also accusative
• كيسَ → direct object, so accusative
• النومِ → second term of iḍāfa, so genitive

In normal unvocalized Arabic writing, these short vowels are usually omitted.

Good question. With صديقي, the ـي possessive suffix affects how the ending appears.

Underlyingly, it is still the subject and therefore nominative, but the case ending is not obvious in the normal written form.

So even if you do not visibly see a final ـُ, grammatically صديقي is still the subject in the nominative role.

This is very common with nouns that have attached pronoun suffixes.

Yes. The verb agrees with the subject, not with the objects.

The subject is صديقي = my friend, which is singular masculine.

So the verb must also be singular masculine:

• يحزم = he packs

It does not matter that the things being packed are two items.

Yes.

The Arabic present tense can often correspond to either:

• he packs
• he is packing

The exact English translation depends on context.

So يحزم صديقي... could mean either:

• My friend packs the air mattress and the sleeping bag
• My friend is packing the air mattress and the sleeping bag

Both are possible unless the surrounding context makes one meaning clearer.

A helpful pronunciation is:

yaḥzimu ṣadīqī al-martabata al-hawāʾiyyata wa-kīsa an-nawmi

A few notes:

• ḥ in yaḥzimu is a stronger h sound from the throat
• ṣ in ṣadīqī is an emphatic s
• wāʾ in hawāʾiyya includes a hamza sound
• wa-kīsa an-nawmi reflects how ال in النوم is pronounced after wa

A simpler learner-friendly approximation is:

yah-zi-mu sa-dee-qee al-mar-ta-ba al-ha-waa-ee-ya wa kee-sa an-nawm

Yes. Depending on context, المرتبة الهوائية can be translated naturally as:

• the air mattress
• the inflatable mattress

The exact English wording depends on what sounds most natural in the situation. In many contexts, air mattress is the best translation.