These roomy shoulder bags, with their wide, easy-to-use shoulder straps, clever compartmental organisation and stylish looks, are a very popular alternative to backpacks for everyday use. Despite their larger volume and single shoulder strap, they sit securely on the back when cycling and don't need to be put down to reach what you want. This functional advantage made them a firm favourite with bike messengers. The wide selection of fashionable designs and materials available nowadays has drawn even more fans to these practical bags.