Abstract: An improved multi-chamber intravenous bag apparatus including a collapsible bag forming a chamber of substantially non-reduced cross-dimension along the entire bag. The device includes a pinching mechanism extending across the entire bag to create two subchambers, such mechanism preferably having interengageable male and female members. Fluid may be added to each subchamber and combined upon removal of the clamp. The device promotes quick, efficient, and economical fixing and administration of fluids.