A substantially tubular bag for containing material and protecting same against moisture and fine particle migration or contamination, and having improved resistance to breakdown of structural integrity during loading and handling, said substantially tubular bag comprising:
- at least one outer layer operably configured to form an outer tube member having an outer surface, an inner surface, a first end at which said bag is to be opened for access to said material and a second end opposite to said first end;
- at least one inner layer operably configured to form an inner tube member having an interior region, said inner tube member operably disposed within said outer tube member and having an outer surface, an inner surface and a first end and a second end positioned opposite to said first end,
- said at least one inner layer being formed from a substantially moisture and fine particle impermeable material,
- said outer surface of said inner tube member and said inner surface of said outer tube member being juxtaposed in substantially adjacent relation to one another, and operably configured so as to extend substantially coextensively along a common longitudinal axis, with said first ends of said inner and outer tube members and said second ends of said inner and outer tube members operably positioned in respective substantial registry with one another, so as to provide a first common bag end and a second common bag end, respectively, said first and second common bag ends arranged substantially opposite one another;
- means operably arranged across said inner surface of the first end of said inner tube member corresponding to said at least one common bag end, for sealing closed said interior region of said inner tube member end to preclude escape of said material and preclude intrusion by moisture or fine particle migration and contamination, said inner sealing means extending transversely to the longitudinal axis of said inner tube member at a selected distance from said inner tube member end;
- means, operably arranged across said first end of said outer tube member corresponding to said at least one common bag end, for closing said at least one end of said outer tube member,
- means operably longitudinally spaced from said at least one common bag end of said first end, for enabling positioning of said at least one common bag end in a folded-over configuration substantially adjacent a portion of said outer surface of said outer tube member, said at least one common bag end being further affixed to said portion of said outer surface of said outer tube member, with said inner sealing means operably positioned substantially between said at least one common bag end and said folding means to substantially preclude material with which said bag may be filled from spreading apart opposed sides of the inner layer, and contacting and exerting force directly upon said inner sealing means so as to protect said inner sealing means against damage resulting from loading and handling stresses.