Leather satchels are usually made of firm, thick cow leather. The leather is vegetable-tanned. Historically, school satchels were inspired by soldiers' satchels. Leather briefcases have a long tradition. From the small ones to the pilot's case, there are infinite varieties. Like the satchel, they are mostly made from robust cow leather but soft goatskin is also used. Today's travel bags are usually made of light synthetic fibre. But here you can still find beautiful travel bags made of genuine leather. Shoulder bags fall somewhere between briefcases, backpacks and handbags and are often made of leather. Leather backpacks are still widely used and can often be seen in the streets.