Made from 840D Polyester and 1200D textured Polyester with inserts in simulated leather and EVA finishing, the RA303 comprises a pair of expandable side bags each one expanding from 20 to 29 litres. Internal storage is supplemented further by two zipped front pockets. Both side bags have fire-retardant bases to cater for the probable close proximity to exhaust pipes, though it is advisable to avoid direct contact with the exhaust. For transportation off the bike they are equipped with detachable shoulder straps for comfort. Each is equipped with a fluorescent orange rain cover for inclement weather. Mounting the bags is achieved via 3 fastening belts, two with Velcro and one central for safety plus two elastic straps with hooks.