If i already have an ipod touch 4th generation, can i upgrade to an ipod touch 5th generation?

I have an ipod touch 4th generation and i really want to get the 5th generation and I was wondering if i could upgrade instead of having to buy one for $300? And if i do upgrade will the new ipod come with the packaging (headphones,lightning cable) and how much would it cost to upgrade? please help!