What is the significance of the bamboo tree that naruto carries at the end of the op? Naruto carries a bamboo tree at the end with some stuff hanging from it like a Christmas tree.
Is there any significance to the bamboo?
This seems to me to be a reference to Tanabata festival. 

Tanabata is a traditional star festival, celebrating the meeting of the deities Orihime and Hikoboshi (represented by the stars Vega and ALtair).

According to legend, 


  the Milky Way separates these lovers, and they are allowed to meet only once a year on the seventh day of the seventh lunar month of the lunisolar calendar. (1)


There is a tradition to write wishes on small pieces of paper and hang them on a bamboo tree:



So I would way Naruto is holding a small wishing tree with wishes from his friends.