BD Black Diamond Trail Zip 18 is a backpack designed for trekking, for daily excursions during which there is a need for a comfortable, light and large enough backpack to be able to store everything inside. In the main compartment you can find a small internal pocket for storing all personal items such as wallet and keys while on the outside there is a pocket with the reflecting Black Diamond logo to be seen even at night. In the side parts there are also pockets that look like sleeves inside which you can put your trekking poles. The backrest is comfortable and breathable and is also equipped with four small rings: with these you can in fact attach Trail Blitz to your larger hiking backpack so as to have the small backpack for the most demanding days. BD Black Diamond Trail Zip 18 trekking backpack