Cold

Padlock / cable lock would make you and your backpack safer.

Leggings are comfortable and don’t take up any space in your suitcase.

It is recommended to bring some comfortable bras and one quick-drying bra for swimming/sports etc.

Keep valuables in a safe place. Burglars come without warning!

Insect repellent spray

Insect repellent clothes

Natural mosquito repellents

You can not find / buy toilet paper  everywhere. Therefore it is nice to have before camping starts.

Vignettes / toll tickets for international highways.

Nice2have for swimming.

Address list of friends/relatives the send postcards from travel destination
 

New Zealand drives on the left. If you are used to driving on the right side, you should invest enough time to get used to it.