The phone bag is made of lightweight and durable synthetic leather. The high-quality gold metal hardware is highly resistant to rust, and the zippers are smooth enough, there is no need to worry about sticking problems.
A messenger bag (also called a courier bag) is a type of sack, usually made of cloth (natural or synthetic). It is worn over one shoulder with a strap that goes across the chest resting the bag on the lower back. While messenger bags are sometimes used by couriers, they are now also an urban fashion icon.