How to carry a SLR camera on the road? Can it be placed in a tank bag?

It is best to carry the SLR camera in a special camera bag during travel to avoid damage due to bumps. Photography bags are divided into large-capacity backpacks and smaller-capacity shoulder bags. The shoulder bag with a flap looks like a postman's backpack, or may be called a "messenger bag". "Mailbox bag" seems to be a typo, I have never heard of it. The "messenger bag" also has an inner liner with good protective properties.