Alternatively, tube 16 and cap 17 may be eliminated completely andthe open end of neck 15 may be closed by a suitable clamping device such as the clamp shown and described in U.S. Pat. No. 3,523,534.The side walls 14 extend along opposite longitudinal sides of the pouch and, as illustrated most clearly in FIG. 3, are formed as folded extensions of top wall 12.