(image courtesy of Mountain Leon)
Choose a light one because it gets a lot heavier when you walk for long time carrying it on your back.
Again choose a light one. Here the most important thing is to choose the lightest product!
If you are traveling only in summer, you don't really need it. Because it is always hot. Also if you cannot afford for it you can buy a light blanket.
That's not a have to but better if you have.
5. Plastic food containers
If you don't want to share your food with bugs then you need these kind of containers.
6. First aid kit
You might think that it is not really essential but you can't know what will happen!
7. Pocket knife
8. Camping bag
Choose a bag that you can open only from the top but also from the sides. I mean don't get all the things out just to get something on the bottom of your bag.