back packs 1.zipper pocket on bottom 2.side compression ... 2 side bottle holder 4.light weight fabrics,buckles,webbin back packsSize:45*32*21cmVolumn:30L+5LMaterial :600D ripstop,210D nylonSub ... -material:SBS ZIPPER,nylon webbingcolor: dark blue,black,green,red,Feature:1.zipper pocket on bottom2.side ... good service!shanghai aimika industrial and trading company,ltd. back packs