Few Tips:
1. A little bit of cash (if it needs some expenses such us fares and others)
2. Bags that filled with personal necessities such as clothes, medicines, jacket, towel, etc.
3. Food, food is definitely very important especially in hiking, mountain climbing and overnight trip.
4. Tents
5. Lighter
6. Knifes and other can openers (light kitchen utensils)
7. Pens and Notepads (if any)
8. Cameras of course
9. Sound speakers (if you like)
10. small rope for emergency cases
11. And above all, pray before and after your tour...
* There is no need to bring heavy luggage if you don't want some hustles while walking, riding or while going too far places. I hope this will help you whether it is a big or small trips.