I bought the DCC-1570 case in 2016 together with the Canon Powershot SX720HS. The case fits this camera. I can't answer whether it also applies to the PowerShot SX740HS. Canon can do that best, because they know the dimensions of the cameras and also the dimensions of the case.

This case is a practical protective cover that does not have its own carrying strap. When the camera is in the case, the camera strap takes over this function.