A film comprising: a gas barrier resin having a glass transition temperature of 70 °C or below; and an elastomer, wherein the film has an oxygen permeability coefficient of 200 mL/(m 2 ·day·atm) or less, and in a case where tension is applied to stretch the film in a machine direction at 20 °C such that a twofold increase in length of the film is kept for 30 seconds, and then the tension is released, a ratio L 2 /L 1 is 1.5 or less, where L 1 denotes a length of the film in MD prior to application of the tension and L 2 denotes a length of the film in MD subsequent to release of the tension, the film comprising: at least one gas barrier layer formed from a polymer comprising the gas barrier resin; and a plurality of elastomer layers formed from a polymer comprising the elastomer, wherein the film has a laminated structure in which the at least one gas barrier layer and the elastomer layers are each laminated alternately and amount to a total number of 3 or more, and the sum of the thicknesses of the gas barrier layer(s) and the elastomer layers is 10 μm or more, the film further comprises, as at least one of the elastomer layers, at least one elastomer layer formed from a polymer comprising a styrene elastomer having a double bond, wherein at least one of the at least one elastomer layer is laminated as an outermost layer, the gas barrier resin provides a film having an average thickness of 20 μm, an oxygen permeability coefficient of the film being 200 mL/(m 2 ·day·atm) or less, the glass transition temperature is a value determined based on a differential scanning calorimetry in accordance with JIS K 7121, and the oxygen permeability coefficient is a value determined at 20 °C and at a relative humidity of 65% in accordance with JIS K 7126-2. a gas barrier resin having a glass transition temperature of 70 °C or below; and an elastomer, wherein the film has an oxygen permeability coefficient of 200 mL/(m 2 ·day·atm) or less, and in a case where tension is applied to stretch the film in a machine direction at 20 °C such that a twofold increase in length of the film is kept for 30 seconds, and then the tension is released, a ratio L 2 /L 1 is 1.5 or less, where L 1 denotes a length of the film in MD prior to application of the tension and L 2 denotes a length of the film in MD subsequent to release of the tension, the film comprising: at least one gas barrier layer formed from a polymer comprising the gas barrier resin; and a plurality of elastomer layers formed from a polymer comprising the elastomer, wherein at least one gas barrier layer formed from a polymer comprising the gas barrier resin; and a plurality of elastomer layers formed from a polymer comprising the elastomer, wherein the film has a laminated structure in which the at least one gas barrier layer and the elastomer layers are each laminated alternately and amount to a total number of 3 or more, and the sum of the thicknesses of the gas barrier layer(s) and the elastomer layers is 10 μm or more, the film further comprises, as at least one of the elastomer layers, at least one elastomer layer formed from a polymer comprising a styrene elastomer having a double bond, wherein at least one of the at least one elastomer layer is laminated as an outermost layer, the gas barrier resin provides a film having an average thickness of 20 μm, an oxygen permeability coefficient of the film being 200 mL/(m 2 ·day·atm) or less, the glass transition temperature is a value determined based on a differential scanning calorimetry in accordance with JIS K 7121, and the oxygen permeability coefficient is a value determined at 20 °C and at a relative humidity of 65% in accordance with JIS K 7126-2.