A German backpacker who has been missing in remote Queensland for 15 days reportedly fought kangaroos with his bare hands, slept in the open and drank water from puddles during his journey in the outback.

Police are continuing to search for 26-year-old Daniel Dudzisz, who was last seen walking between Windorah and Jundah, about 1200 kilometres west of Brisbane.

Missing German backpacker Daniel Dudzisz.

Mr Dudzisz has been in Australia for a few months and it is believed he had planned to walk 4000 kilometres from New South Wales to Uluru, via Queensland.

Police believe Mr Dudzisz is under-prepared for the journey, with little more than the clothes on his back and a few staple items in a bag.