Liquid container

A container for fluids, comprising:

• an outer casing;
• a flexible gas tight or liquid tight inner bag disposed in the outer casing, the inner bag capable of storing fluids;
• a valve fixedly connected to the inner bag, the valve capable of controlling fluids to flow in or out of the inner bag, the valve connected to the outer casing to form a seal with the outer casing;
• a ventilation structure arranged in the valve or on the outer casing, the ventilation structure capable of controlling gas to flow in or out of a space between the inner bag and the outer casing;
• a flexible separation bag capable of venting gas sleevely disposed on an outer surface of the inner bag, the separation bag disposed between the inner bag and the outer casing;
• a plurality of convex portions protruding from a surface of the separation bag, each of the convex portions extending in a direction from a top of the separation bag toward a bottom of the separation bag;
• and
• first auxiliary air passages are formed between two adjacent convex portions, the first auxiliary air passages capable of allowing gas circulation, and the first auxiliary air passages are always in communication with the ventilation structure;
• wherein the separation bag is provided with openings capable of venting gas.