Hanxue Packable Travel Backpack Daypack Cycling Hiking Backpack Outdoor backpacks Frame Rucksack Made of best Nylon,high quality and durable, better ventilation not easy to deformation Adjustable backpack system, can adjust the height according to the requirements of different height Reflective line on the Backpack, more safely in the Night, with lifesaving whistle and Large bearing capacity,20.86"*13.38"*7.87", Super versatile and multi-functional pack. Unique design straps ease the pressure on the shoulder, and The cushion with high permeability material, have never cover the sweat when you carry it a long time The professional Backpack is ideal for various activities such as Climbing, Hiking, Holidays, Trveling and so much more