How to politely decline if someone offers to send a gift?

[Anyaaa]

My Japanese penpal has asked me if I want anything from Japan when she sends me her first letter. I obviously want to be polite, and I presume the first way to go about that is declining her offer. What's a good way to say that I don't want to bother her?

I saw on wikipedia the phrase "お気づかいなく" - but I don't understand what it means and I don't want to use things I can't understand

Edit: What if I were to say "いいですよ, 手紙だけも良いです"?
I want to say something like "No, it's fine! I would be happy with just a letter"

[cmwatkins]

お気づかいなく is a nice polite way to say, "Don't worry about it."
I've heard it used before, and my favorite Japanese expert (my wife ) confirmed it's appropriate for the situation.

[Anyaaa]

Thanks very much! Thank your wife for me too