Backpacks and other over the shoulder bags are very popular ways of carrying your things, thanks to the practical nature of them. They are a staple of young people's accessories. The familiarity means both are popular choices among men entering the professional workforce. Unfortunately, this means they are often worn over suits and blazers; a sure-fire way to ruin the jacket quickly.
Leather is a common choice for shoemakers and is often seen in jackets. It is a unique material with aesthetic appeal but there is a caveat; you must care for it in a specific way. No throwing it in the washing machine!