Abstract: A container bag for use in preserving blood or its component materials in liquid nitrogen. The container bag has excellent physical properties especially in quite low temperature conditions and is composed of: an inner layer made of ethylene-tetrafluoroethylene copolymer and an outer layer made of one member selected from the group consisting of polyethylene phthalate, polyethylene naphthalate, cross-linked polyethylene, perfluoroalkoxy resin, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer and aromatic polyimide.

Abstract: A package of, for example, a medical instrument adapted to be sterilized by ethylene oxide gas, which comprises a package body in which a paper substrate is coated with a polyester resin emulsion layer, and a thermoplastic resin emulsion layer, and a thermoplastic resin emulsion layer is laminated on said polyester resin emulsion layer, and a covering sheet heat-sealed to the thermoplastic resin emulsion layer around a packed material, thereby hermetically sealing the package, said package having an indicator enabling the completion of disinfection to be visibly recognized.

Abstract: A package for sterilization providing for sterilization by gas and also by steam which comprises a base plate formed of a laminate of a paper layer and a plastics layer mainly consisting of butyral resin; and a plastics covering sheet whose edge is heat-sealed to said base plate around a packaged article.