| http://www.w3.org/ns/prov#value | - The pouch 50 may include relief on or along an interior surface of one or both of the first and second sidewalls 52, 54 to provide fluid or air flow channels 25, for example as shown in FIG. 1, between the sidewalls when a vacuum, for example, is being drawn through the check valve 260 or through the fluid path 66 disposed at the position 68 b.
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