Flexible bag

A flexible bioprocess bag comprising:

• a number of flexible panels which are sealed to each other;
• wherein one of the number of flexible panels is a bottom panel, comprising a quadrilateral middle part having two opposite first side edges substantially the same length as a diameter of a cylinder substantially matching a form of a side surface of the bag when the flexible bioprocess bag is filled and placed within a cylindrical bioreactor vessel, said bottom panel further comprising two triangular parts, each connected along their bases to one of the first side edges of the middle part,
• wherein the two first side edges of the middle part where the bases of the triangular parts are connected are shorter than two remaining side edges, called second side edges of the middle part,
• wherein the two second side edges are curved such that a circle having the same diameter as a cylinder substantially matching the form of the side surface of the bag when the bag is filled and placed within the cylindrical bioreactor vessel still fits inside the middle part, and
• when the flexible bioprocess bag is filled said bottom panel will constitute the bottom of the bag and parts of the side surface of the bag, said parts of the side surface being bent side parts of the bottom panel.