The present invention relates to a back or shoulder carried bag or case that includes a support strap supported on part of a back or shoulder of a person carrying the bag or case comprising a back support surface disposed toward the back of the person that includes a support strap cinching arrangement. This new method permits utilization of the advantages of SSFP methods also for spectroscopic recordings, in particular for chemical shift imaging. The inner ends have couplings with pivotal portions and fixed portions, the pivotal portions being at least partially positioned within the recesses, and the fixed portions being attached to the substantially flat surface. By selecting the width of the electrode based at least in part on the period of the resonator, a spurious-mode of the passband of the PBAW device may be suppressed.