Container for liquid comprising: a first level of storage for the liquid, a second level of pressurization for a gas, in which the first and second levels can be stored flat when empty, in which the first level and / or the second level comprises a first and / or a second anti-fitting connection part having: - a first connection body, - a first base, - a first non-waterproof stop to limit the movement of the first, and - a first waterproof shoulder for limit the movement of the first base and to prevent the return of fluid, and - the first connection means to a third connection part of a fluid injection and / or extraction system.
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