Embodiments of the invention relate to {HEAD ~ a fluid enclosure} including a structural filler and {TAIL ~ an outer enclosure wall} conformably coupled to the structural filler 
Embodiments of the invention relate to { HEAD ~ a fluid enclosure } including a structural filler and { TAIL ~ an outer enclosure wall } conformably coupled to the structural filler
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH