[Grammar] a backpack to carry your books/ a backpack to carry your books in?

[Mensu]

Dear teachers,
Here are two similar sentences:
#1. Why don't you get a backpack to carry your books?
#2. Why don't you get a backpack to carry your books in?

Q:When I want to advise my friend who is puzzled about how to carry all his/her books out of the classroom, which sentence should I say? Or both are possible?

I'm wondering if there are any circumstances or not where one of the sentences above cannot be replaced with the other one and if they are equal or not.

Thank you in advance.

 

[bhaisahab]

Dear teachers,
Here are two similar sentences:
#1. Why don't you get a backpack to carry your books?
#2. Why don't you get a backpack to carry your books in?

Q:When I want to advise my friend who is puzzled about how to carry all his/her books out of the classroom, which sentence should I say? Or both are possible?

I'm wondering if there are any circumstances or not where one of the sentences above cannot be replaced with the other one and if they are equal or not.

Thank you in advance.

They are both possible. I prefer #2.

 

[billmcd]

Dear teachers,
Here are two similar sentences:
#1. Why don't you get a backpack to carry your books?
#2. Why don't you get a backpack to carry your books in?

Q:When I want to advise my friend who is puzzled about how to carry all his/her books out of the classroom, which sentence should I say? Or both are possible?

I'm wondering if there are any circumstances or not where one of the sentences above cannot be replaced with the other one and if they are equal or not.

Thank you in advance.

Well, the grammar purist would quote the rule of never ending a sentence with a preposition. With that said, I must say that many/most of us adhere to the rule when convenient. And in the case of your example #2 it is "convenient" for me and more specifically, unnecessary. In the context presented, where else would one carry the books but in the backpack?

 

[emsr2d2]

Another purist might argue that "Why don't you get a backpack to carry your books?" suggests that you might consider asking/forcing a backpack to carry your books, in the same way you might say "Why don't you get your brother to carry your books?"

The same purists would, I imagine, prefer "Why don't you get a backpack in which to carry your books?"