Disclosed herein is a user mountable ammunition carrier system for conveniently storing and carrying hunting and shooting accessories by a hunter while navigating dense brush and foliage. The catalyst composition has the capability of substantially simultaneously catalyzing the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides. A weighting parameter value is determined by which the first curve and second curve are blended at the second data point. The second cooling pipe is provided in the gradient coil so as to be in parallel with the first cooling pipe, and circulates a coolant in an opposite direction to a direction in which the first cooling pipe circulates the coolant. Once full, the chute and spreader assembly are withdrawn, tension is applied to the bag mouth, and the slider assembly moves the zipper slider to a fully closed position.