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