Some hiking bags are more basic than others. So you can look at the accessories that you find useful. For example, some bags are equipped with a rain cape to protect the bag from the elements. Another accessory which can be useful and which is very fashionable is a water bag, also called a tank bag. It is a refillable bag with a tube that goes outside the bag. So you can drink whenever you want through this tube, without having to open your bag to retrieve your gourd or bottle.