طارد الحشرات وواقي الشمس بالكيس.

Because Arabic normally leaves out the present-tense verb to be.
So طارد الحشرات وواقي الشمس بالكيس can mean something like the insect repellent and the sunscreen are in the bag without saying are.

This is very normal in Levantine and in Arabic generally.
If you wanted a past meaning, you would usually need a verb.

A natural breakdown is:

• طارد الحشرات = insect repellent
• و = and
• واقي الشمس = sunscreen / sunblock
• بالكيس = in the bag

So it is basically:

[item 1] + and + [item 2] + [location]

Arabic often uses a plural noun in expressions like this where English uses a singular noun inside a compound.

So طارد الحشرات is literally something like repeller of insects.
That is the normal Arabic way to express the idea.

Similarly, English often compresses nouns into compounds, while Arabic usually builds a phrase instead.

Here بـ means in.

In Levantine, بـ is very commonly used for location:

• بالبيت = at home / in the house
• بالسيارة = in the car
• بالكيس = in the bag

You may also hear في in some contexts, but بالكيس sounds very natural in Levantine.

Also, بـ + الـ gets written together:

• بـ + الكيس = بالكيس

They are iḍāfa constructions, often called a construct phrase.

That means:

• طارد الحشرات = literally repeller of insects
• واقي الشمس = literally protector from the sun or sun protector

Arabic uses this structure a lot where English uses compound nouns like:

• car door
• insect repellent
• sun screen

So instead of making one long compound word, Arabic builds a noun phrase.

Because in an iḍāfa construction, the first word normally does not take الـ.

So:

• طارد الحشرات is correct
• واقي الشمس is correct

But forms like:

• الطارد الحشرات
• الواقي الشمس

would be wrong in this structure.

In an iḍāfa phrase, the definiteness is usually determined by the second noun.
So because الحشرات and الشمس are definite here, the whole phrase is understood as definite.

A rough Levantine-style pronunciation would be:

ṭāred il-ḥasharāt w-wāʔi sh-shams bil-kīs

A few notes:

• طارد sounds roughly like ṭāred
• الحشرات sounds like il-ḥasharāt
• وواقي looks strange because there are two و’s in a row:
  • the first و = and
  • the second و is part of واقي
• so you may hear it as w-wāʔi or a smoother u wāʔi
• in many Levantine accents, ق in واقي is pronounced as a glottal stop, so wāʔi
• بالكيس sounds like bil-kīs

Because ش is a sun letter.

When الـ comes before a sun letter, the l sound disappears and the next consonant gets doubled in pronunciation.

So:

• الشمس is pronounced ish-shams or sh-shams depending on connection and dialect
• not al-shams

But الحشرات begins with ح, which is not a sun letter, so the l is still pronounced:

• الحشرات = il-ḥasharāt

Yes, كيس is a very common word in Levantine, especially for a bag, plastic bag, or sack.

Depending on the kind of bag, other words may be more natural:

• شنطة = bag, purse, suitcase
• حقيبة = bag, more formal
• كيس = bag, especially a simple carry bag or plastic bag

So بالكيس is very natural if the context is a regular bag or shopping/plastic bag.

They come from forms that are often called active participles, but here they function like nouns naming objects.

So:

• طارد = something that repels
• واقي = something that protects

In this sentence, they are not really acting like ordinary descriptive adjectives such as big or new.
They are naming items:

• طارد الحشرات = insect repellent
• واقي الشمس = sunscreen

Yes. In real life, especially in product language or casual speech, you may hear:

• طارد حشرات
• واقي شمس

These can sound a bit more like generic product names, similar to saying insect repellent or sunscreen as categories.

The versions with الـ:

• طارد الحشرات
• واقي الشمس

sound a bit more definite or slightly more standard/formal.

So both patterns can be encountered, and context matters.