This bag is for the motorcyclist, cyclist or hiker. It has D rings located one at each of the bottom corners and a spring clip. This then allows the wearer to choose which shoulder to sling over. The adjuster is solid brass, as are all the fittings. The bag is capable of providing many years of reliable service. The shape of the bag means that it naturally hangs in the middle of the wearer’s back. When worn on the bike, it doesn’t flap around. This bag is plenty large enough to fit a change of clothing [or] enough basics for a day-trip. A zipped pocket is designed to fit a large smartphone and a larger front pocket for your wallet etc. All zip openings are slashed so that rain won’t get in. The prototype for this bag was subjected to ‘regular’ torrential rain with 100% success. Zips are YKK (metal) throughout.