12l ultralight waterproof bicycle hydration water bag sport outdoor cycling riding travel mountaineering backpacks 60

material:polyester size: 24*15*44cm (width*thickness*height ) 9.45*5.91*17.32inch function:waterproof bicycle backpacks color:yellow,green,purple,black,blue,rose,red,orange,sky blue special hole design for water bag,but not include the water bag. reflective strips for safe riding at night. suitable for outdoor activities like cycling, rock-climbing and hiking, etc. note:there is a water bag cover on the side of the bag. it is design for water bag