The hook-and-loop saddle attachment keeps the bag firmly connected to your bike;The low-profile seatpost attachment prevents the bag from swinging while riding;Internal pockets securely hold credit cards and valuables;The loop on the front of the bag easily attaches clips for rear lights;Reflective elements enhance visibility for maximum safety in any conditions;The light and robust material holds up to elements without contaminating contents;940 cc (57 cu in) capacity;