Product Description : S : For internal dimensions of approximately : ( 60 x 123 mm） M : For internal dimensions of approximately : (75 x 135 mm) L : For internal dimensions of approximately : ( 80 x 150 mm) XL : For internal dimensions of approximately : ( 88 x 165 mm) 1、Car holder easy seat can be quickly and easily attached to a bicycle , motorcyle , stable suck prison, very onvenient and practical 2、The standard universal waterproof bag with fou claws deduction , a deduction that is solid with the base ,for the bike trails in the range of 20mm-25mm 3、 High -Quality waterproof double zipper, the base for the rotating head design, can rotate 360 degrees,adjustable viewing angle Material :ABS + PU lether waterproof Color : Black Waterproof package level :IPX4 regular shipping three sizes worker measurements are not avoiding a slight deviation Package Include: 1 * Waterproof bicycle / motorcycle case 1 * Bicycle / motorcyle sand holder 2 * EVA gaskets Note : Cell phone and bicycle are not included