To develop and propose a structure for easily self-supporting a non-self-support flat small bag made of flexible laminated film and to prevent film residuals from being separated from a bag body when opening a discharging passage of the small bag.

The small bag for self-support type liquid package is formed by heat-sealing the laminated film into a bag. In this bag, the top of a bag body has a mouth stopper projecting in the shape of one of various caps. The lower part of the bag body has a leg bottom for self-support, in which a groove-like cutting line is formed so as to extend from sealed portions of both sides to a laterally heat-sealed portion of the lower side. A tear-open guide line for opening the bag is formed in a boundary portion between the mouth stopper and bag body.

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