BAG SIZE: 45*20*15CMCOMPACT SIZE and DOUBLE-LAYER: The special inner layer can be used for holding water bladder.bladder is not includedBREATHABLE and COMFORTABLE : Padded back/shoulder strapes, and coverd with breathable mesh, which provide you enough airflow and a super comfortable sports time.ADJUSTBALE: Adjustable shoulder strap/chest strap/waist strap, makes sure it doesn't bounce when you are doing outdoor sport.WATERPROOF NYLON: Highly tear resistant nylon, water-resistant and durable for outdoor activities.MULTI-USE: Suitable for all hiking,camping,climbing,traveling outdoor activities Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin