{HEAD ~ The collapsible position} occupies less volumetric weight as compared to the fully extended position so as to reduce the volumetric weight when the backframe is in {TAIL ~ transportation} and storage 
{ HEAD ~ The collapsible position } occupies less volumetric weight as compared to the fully extended position so as to reduce the volumetric weight when the backframe is in { TAIL ~ transportation } and storage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH