Giant wp seat bag is constructed from high quality laminated nylon with welded seams mking it completely waterproof light weight quick release mounting with reflective markings and tail light clipfeatures waterproof seat bag light weight high volume seat bag perfex hi frequency welded seams 840d tpu laminated nylon 100 waterproof quick release mounting reflective accents for improved low light visibility and tail light hangersizes volume 15l weight 195g dimensions 18x12x11 cm