Yes, this is easy to use.  However, one can adjust the strap after it is locked.  Simply pull up on the adjustment and push the strap through the bottom loop.  It loosens enough to open any compartment not locked.  If the belt is through a case handle, then it can't be slipped off, but if not through a handle, it could certainly be slipped right off the suitcase.  I don't understand the advert that the strap can't be adjusted. I don't feel fully confident in this trap.