| http://www.w3.org/ns/prov#value | - The preferred material for the walls of the container of this invention is an air-impermeable flexible film of thermoplastic material, such as polyethylene, polypropylene, nylon, vinyl polymers, polyethylene-nylon laminates, polypropylene-nylon laminates, ethylene-vinyl acetate copolymers, laminates of polyethylene with ethylenevinyl acetate copolymers, or the like.
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