The Backpack is constructed with waterproof 900D high density polyester material. Heay duty alloy zipper. Wearable as a cross shoulder bag-style or backpack-style. MOLLE system on the front for the expansion Multi-function military computer bag with fast release buckle and zipper closure design, You can take it by doule shoulder, single shoulder and hand. Rigid build and superb load carrying comfort can be placed on luggage. This model bag molle system plus Seibertron luggage strap could fit most models of luggage perfectly. For more details of using, kindly refer to sixth and seventh photo on the side. (Seibertron luggage strap need to be purchased separately).