What does dans sac il y a mean in French?

* Dans means "in"

* son sac means "his/her bag"

* il y a means "there is/are"

Here's how you can use it in a sentence:

* Dans son sac il y a un livre. (In his bag there is a book.)

* Dans son sac il y a des crayons. (In her bag there are pencils.)