Guardo el repel·lent d'insectes amb el sac de dormir.

Guardo is the 1st person singular present tense of guardar, so it means I keep, I store, or sometimes I put away.

Catalan often leaves out the subject pronoun, so Guardo... by itself already means I store/keep... without needing jo.

Catalan usually omits subject pronouns unless they are needed for emphasis or contrast. The verb ending -o already shows that the subject is I.

So:

• Guardo el repel·lent... = I store the insect repellent...
• Jo guardo el repel·lent... = I store the insect repellent... (more emphasis)

Yes. Repel·lent is a masculine singular noun here, so it takes el.

• el repel·lent = the repellent

If you were speaking more generally, you might also hear the full phrase el repel·lent d'insectes as a fixed noun phrase meaning insect repellent.

D'insectes means of insects or, more naturally in English, insect in the phrase insect repellent.

It comes from:

• de = of
• insectes = insects

Catalan contracts de to d' before a vowel sound, so:

• de + insectes → d'insectes

This is very common:

• d'aigua = of water
• d'acer = of steel

Because the idea is repellent against insects in general, not just one insect.

So repel·lent d'insectes is the normal way to say insect repellent. This works like many noun combinations where Catalan uses de + plural noun to express a general category.

Amb usually means with.

In this sentence, it most naturally means together with or alongside:

• Guardo el repel·lent d'insectes amb el sac de dormir.
• I store the insect repellent with the sleeping bag.

So the idea is that the repellent is being kept in the same place as the sleeping bag.

Yes, at least a little. Like English with, Catalan amb can sometimes attach in more than one way.

The most natural reading is:

• I store the insect repellent together with the sleeping bag.

But structurally, someone could momentarily wonder whether amb el sac de dormir is modifying the action in some other way. In normal context, though, the intended meaning is usually clear: the two items are being stored together.

If you wanted to make that idea even clearer, context or a different wording could help.

Literally, it is the bag of sleeping, but in normal English that corresponds to the sleeping bag.

This is a very common Catalan pattern:

• noun + de + infinitive

Examples:

• sac de dormir = sleeping bag
• màquina de rentar = washing machine
• sala d'esperar = waiting room

So de dormir is just part of the standard expression sac de dormir.

In many fixed expressions for objects and their function, Catalan often uses de + infinitive, not per + infinitive.

So the standard expression is:

• sac de dormir = sleeping bag

Even though English might make learners expect something like bag for sleeping, Catalan normally says bag of sleeping in this type of structure. It is best learned as a set phrase.

That is the punt volat: l·l.

It shows that the two l letters are pronounced separately, rather than as the digraph ll, which has a different sound in Catalan.

So:

• ll = a palatal sound
• l·l = two distinct l sounds, with the special dot between them

This spelling appears in words like:

• repel·lent
• col·legi
• il·lusió

It is an important spelling feature in Catalan.

Yes, Catalan allows some flexibility in word order, though the original sentence is very natural.

For example, you could also say:

• Amb el sac de dormir, guardo el repel·lent d'insectes.

That gives more emphasis to with the sleeping bag.

But the most neutral order is:

• Guardo el repel·lent d'insectes amb el sac de dormir.

Yes. Guardar is a broad verb. Depending on context, it can mean:

• to keep
• to store
• to put away
• to save
• sometimes even to guard/protect

In this sentence, store or keep fits best, because you are talking about where the insect repellent is kept.