| http://www.w3.org/ns/prov#value | - The walls 14,which are desirably produced from thin plastic film such as polyethylene or the like, are secured together as by means of heat sealing along the opposite sides 12 of the bag and are initially separated from one another along the bottom 13 as shown in dash outline in FIG. 1 to provide an opening, for filling of the bag through the opening whereafter the opening is closed as by means of
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