As shown in FIG 4, a weakened portion 45 is preferably formed in the middle of {HEAD ~ the internal seal} 43 to cause {TAIL ~ the seal} to rupture when pressure is applied to the exterior of the second compartment 42 
to cause
As shown in FIG 4 , a weakened portion 45 is preferably formed in the middle of { HEAD ~ the internal seal } 43 to cause { TAIL ~ the seal } to rupture when pressure is applied to the exterior of the second compartment 42
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH