شنطة النوم في شنطة ضهر.

A basic word-for-word breakdown is:

• شنطة = bag
• النوم = sleep / sleeping
• في = in
• ضهر = back

So the sentence is built from two noun phrases:

• شنطة النوم = sleeping bag
  
  • literally: bag of sleep
• شنطة ضهر = backpack
  
  • literally: back bag

So the whole sentence means The sleeping bag is in a backpack.

Because in Arabic, the present-tense to be is usually omitted.

So instead of saying something like The sleeping bag is in a backpack, Arabic simply says:

• شنطة النوم في شنطة ضهر
• literally: The sleeping bag in a backpack

This is completely normal. In Egyptian Arabic, X في Y often means X is in Y.

The order tells you that.

The pattern here is:

• X في Y = X is in Y

So:

• شنطة النوم = the thing being located
• في = in
• شنطة ضهر = the place/container

That means the sleeping bag is in the backpack, not the other way around.

Because the sentence is talking about two different kinds of bags:

• شنطة النوم = sleeping bag
• شنطة ضهر = backpack

Arabic often builds these kinds of expressions by putting one noun after another. So instead of a special adjective like sleeping or back, you often get a noun-based expression:

• bag + sleep
• bag + back

That is very common.

It is a noun-plus-noun structure, often called an iḍāfa or construct phrase.

So:

• شنطة = bag
• النوم = sleep

Together, شنطة النوم literally means bag of sleep, which English expresses more naturally as sleeping bag.

Arabic often uses this kind of structure where English might use:

• an adjective
• another noun used like an adjective
• or a compound word

This is another feature of the construct phrase.

In Arabic, in a phrase like شنطة النوم, the first noun usually does not take الـ. The definiteness is shown on the second noun, and that makes the whole phrase definite.

So:

• شنطة النوم = the sleeping bag / sleeping bag as a known item

This is different from English, where the goes at the beginning of the whole phrase.

A useful thing to remember:

• in English: the sleeping bag
• in Arabic: the definiteness may show up later inside the phrase

No. ضهر is a noun meaning back.

So شنطة ضهر is not really bag + adjective. It is another noun-plus-noun expression:

• شنطة = bag
• ضهر = back

Together it means back bag, which in normal English is backpack.

So both شنطة النوم and شنطة ضهر are built in a similar way.

A rough pronunciation is:

• shanṭet en-nōm fi shanṭet ḍahr

A few notes:

• شنطة by itself is usually shanṭa
• but before another noun in a construct phrase, many speakers pronounce it more like shanṭet or shanṭit
• النوم is often pronounced en-nōm in connected speech
• في = fi
• ضهر is roughly ḍahr

If you want a simpler learner-friendly version, you can think of it as:

• shanṭa en-nom fi shanṭa dahr

That is not the most precise pronunciation, but it helps at the beginning.

Yes, it fits Egyptian-style everyday wording.

Clues include words like:

• شنطة for bag
• ضهر for back

A more formal or MSA-style version might use vocabulary like:

• حقيبة for bag
• حقيبة ظهر for backpack

But for Egyptian Arabic, شنطة is very common in everyday speech.

Because Arabic words ending in ة often change pronunciation depending on position.

• by itself: شنطة → shanṭa
• before another noun in a construct phrase: شنطة النوم → often shanṭet en-nōm

So the written form stays the same, but the spoken form can change.

This is very common in Arabic, and learners notice it a lot with feminine nouns ending in ة.