Thanks Curtis. The medical supplies in the above are packed for field work. Certainly, I will use plastic bags to seal some of the components, but I feel that to put all the supplies in a watertight container rather defeats the purpose of the design of the bag and may be a handicap when searching for appropriate items during an emergency. Perhaps the trick will be to put the entire, packed bag, into a garden waste plastic bag.
"if at first you don't succeed....Redefine success"!