BAG SIZE: 51*31*19CM Polyester lining Machine Wash, Hand Wash COST EFFECTIVE HIKING BACKPACK - hiking pack has obvious advantages at the cost performance, reliability and quality. You can get a great quality hiking bag of the same quality as a hundreds dollar without spending too much money. COMPREHENSIVE UPGRADED VERSION - Compared with the same style backpack on the market, you will find that this back pack has some differences. Yes, we have made a comprehensive upgrade based on customer feedback. Better fabric, stronger straps, and more durable zippers make this a better camping bag. NO INTERNAL FRAME - This lightweight & comfortable hiker backpack is specially designed for outdoor enthusiasts. Breathable mesh shoulder straps with plentiful sponge padding help relieve the stress from your shoulder. Widened and thickened S-type shoulder straps and high elastic breathable back support for best ventilation and easing burden, gives you more comfortable experience. RAIN COVER INCLUDED - Made with high quality tear Polyester and nylon fabric, tear resistant, anti-scratch, wear resistant. Come with extra waterproof rain cover pouch on the bottom pouch, prevent the water and dust into the backpack, protect your valuables from heavy rain and keep everything dry.