Puffed rice (Pori in Tamil)
Pressed rice (Aval in Tamil, Poha in Hindi)
(Puffed rice and pressed rice are readily available in huge packs in Indian markets.)
Nuts - walnuts, almonds, peanuts (I know, peanut is not a nut)
Salt and chili powder to taste
Just a smidge of oil for roasting
Roast all ingredients individually until crisp in a pan with a teeny smidge of oil coating the pan. Mix all roasted ingredients. Season with salt and chili powder and shake. Pack in zip lock bags for the hike. Don't forget to throw in a spoon in the bag - you don't want to get the chili powder in your hands from where it might make it to your eyes (ouch!).
If you are enjoying this at home, then leave out the almonds and walnuts. Just use peanuts. You can also add some finely chopped onions and tomatoes, and squeeze some lime/lemon juice. Do it just before eating to retain the crunchiness.