An airtight bag is provided for preserving a first substance and at least one second substance. A first opening device is provided for providing a first opening and an access by a user to the first substance in the bag, and at least one second opening device is provided for, subsequent to accessing the first substance via said first opening, providing at least one second opening and an access by the user to the at least one second substance in the bag. The first opening device is positioned such that first opening facilitates the access by the user to the first substance. The at least one second opening device is positioned such that the at least one second opening facilitates the access by the user to the at least one second substance.
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