The material of the inner liner is folded over at opposite edges to form increased thickness margins at {HEAD ~ opposite ends} of {TAIL ~ the pack} 
The material of the inner liner is folded over at opposite edges to form increased thickness margins at { HEAD ~ opposite ends } of { TAIL ~ the pack }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL