Nasa tolda ang laman ng backpack.

Nasa means is in / is at / is on, depending on context. In this sentence, it shows location.

So Nasa tolda means is in the tent.

It is very common in Filipino to begin a sentence with this kind of location phrase.

Not exactly.

• sa is a marker for location, direction, or destination: in, at, on, to
• nasa is commonly used as a predicate meaning is located in/at/on

Compare:

• Pumunta siya sa tolda. = He/She went to the tent.
• Nasa tolda siya. = He/She is in the tent.

So in your sentence, nasa is the natural form because the sentence is describing where something is.

Tolda means tent.

So nasa tolda literally means in the tent or at the tent, depending on context. Here, in the tent is the natural meaning.

Laman literally means content, contents, what is inside, or sometimes filling in other contexts.

In this sentence, ang laman ng backpack means the contents of the backpack or what is inside the backpack.

A useful thing to remember is that laman does not have to look plural in Filipino even if English would normally say contents.

Because the sentence is specifically talking about what is inside the backpack, not the backpack itself.

• Nasa tolda ang backpack. = The backpack is in the tent.
• Nasa tolda ang laman ng backpack. = The contents of the backpack are in the tent.

So this sentence implies that the things inside the backpack are in the tent.

Ng backpack means of the backpack.

Here, ng links laman and backpack to show a relationship:

• laman ng backpack = contents of the backpack

This is a very common Filipino pattern:

• pinto ng bahay = door of the house
• kulay ng kotse = color of the car
• laman ng backpack = contents of the backpack

Ang marks the topic or subject-like part of the sentence.

In this sentence:

• Nasa tolda = predicate / what is being said about something
• ang laman ng backpack = the thing being talked about

So ang does not simply equal English the, even though translations sometimes make it look that way.

A good way to think about it here is:

• As for the contents of the backpack, they are in the tent.

That is why ang appears before laman.

Because predicate-first word order is very normal in Filipino.

So this structure:

• Nasa tolda ang laman ng backpack.

is completely natural.

English often prefers:

• The contents of the backpack are in the tent.

But Filipino very often puts the predicate first:

• In the tent are the contents of the backpack
  or more naturally,
• The contents of the backpack are in the tent.

Both languages are natural in their own way; the Filipino order is not strange.

Yes. That is also correct.

• Nasa tolda ang laman ng backpack.
• Ang laman ng backpack ay nasa tolda.

Both mean the same thing.

The version with ay can sound a bit more formal, careful, or balanced. In everyday speech, many speakers prefer the first version without ay.

No, but it often does, because English loanwords are very common in Filipino.

So backpack is perfectly natural in many contexts.

You might also hear other words depending on the speaker and situation, such as:

• bag
• a more descriptive phrase for a backpack

But backpack in this sentence is completely normal and easy to understand.

Because Filipino does not mark number the same way English does.

Laman can refer to what is inside something, whether that is one thing or many things. English often uses the plural word contents, but Filipino does not need a plural form here.

So:

• laman ng backpack = the contents of the backpack

Even though the English translation is plural, the Filipino word does not have to be.

No, not if the sentence is exactly Nasa tolda ang laman ng backpack.

That specifically refers to the contents.

If you want to say The backpack is in the tent, you would say:

• Nasa tolda ang backpack.

So laman makes an important difference.