Featuresr roll down closure system compresses to 3l for daily use or expands to 10l for multi day tripsr waterproof tpu interior with roll top closure keeps your valuables dryr elastic rope increases bag capacity and keeps your water bottle clothes or maps securely on the bagr reflective tape for increased visibility and night safetyr 2 wide adhesive strap provides quick and stable mounting on the seat postr adjustable webbing with quick release buckle to keep the bag firmly fastened to