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