The Weka Series mid-size 40L size utilizing the ECO AZTEC material for a balance between durability and light weight. The main body is constructed with a simple and technical molding method and reduced fabric switching for improved water resistance and durability. Easy to use air chamber construction with large front stash pockets and zipper pockets. The hip belt has a convenient pocket for storing small items. The top lid is removable and increases the versatility of your luggage capacity. It is a simple design with a beautiful silhouette. This macpac's flagship model improves the functionality of the backpack and allows for a wide range of uses without limiting the outdoor scenes. [Function Description] Simple airroom trekking pack, large stash pocket on the front, zipper pocket, hydration bag compatible, top lid storage pocket, chest strap with adjustable whistle, hip belt with pockets, side stretch bottle pocket, pole loop. Dimensions: S1/H63xW29xD19cm S2/H68xW27.5xD19cm S3/H73xW26.5xD19cm Capacity; S1/37L S2/40L S3/43L Weight: S1: Approx. 4.6 oz (1,365 g) / S2: Approx. 5.1 oz (1,41 g).