A messenger diaper bag has one strap and can either be carried on the shoulder or across your chest. While in cross-body position, the strap helps keep the bag secure and provides a more ergonomic support.
Messenger diaper bags are often designed with both, moms and dads in mind - so you can find them in a wide variety of materials, colors and sizes. Some messenger bags are even convertible, allowing you to switch back and forth from messenger to backpack. Some messenger bags also feature clips to hang from the stroller while out and about with baby!