Your contribution gets you:
~$25 – acknowledgement in the book
~$50 – acknowledgement plus an autographed copy of the book
~$100 – all the above plus a t-shirt
~$500 – all the above stuffed in a badass backpack like mine with your own Annual National Park Pass and an awesome, one-of-a-kind souvenir I get during the trek especially for you!
~$1000 – 2 stuffed backpacks with all the above! One for you, one for a traveling buddy!
safe travels.