& . Equipment Type: Mountaineering bag backpack categories: medium-sized backpack & . Brand: Other outdoor activities: rock climbing mountaineering backpack on foot and bicycle beach ...& . with 1000D anti-tear fiber, with super wear-resistant and waterproof. 450D fiber used inside. Backpack full use of YKK zipper with color and multi-resistant Fu UTX fastener. All high strength nylon suture, wet water, will not rot. zipper Vice rope cord umbrella by Army regulations. Human mechanical adjustable carrying system, optional shoulder, shoulders, belt of three portable way. 3D breathable back pad, to enhance comfort when carrying. Backpack for a main bag, a one-third the size of Vice bags and bags of the right side of a small vice. Open the hidden part of the main bags can double the volume expansion. Adjustable waist strap can be hidden when not in use after the layer in the main pack.& . Specification& . 1. Normal is not out of the bottom of the hidden part Size: Width 29CM X 18CM high 30CM X thick volume: 16L& . 2. After taking the bottom of the hidden part of the actual size: width& . high 46CM X 29CM X 18CM thick volume: 24L waterproof fabric and nylon straps to 1000D high intensity.