A fitment for use on a collapsible bag for dispensing of liquids and semi-solids from the bag, the fitment comprising: (a) a spout comprising a generally hollow cylindrical body having an external surface capable of mating with an aseptic flip-cap, the spout having at one end, a base portion for securing the spout to the collapsible bag; (b) a flip-cap having an outer collar and an inner collar with the outer collar and the inner collar each having an inner and outer surface, the inner surface of the outer collar and the outer surface of the inner collar forming a cavity adapted to be removably attachable to the spout creating an aseptic seal with an inner wall of the spout, the inner surface of the inner collar being capable of attaching to a cap duckbill, the flip-cap further comprising a hollow cylinder section comprising a proximal end and a distal end with each having an inner and outer surface, the hollow cylinder section being fixedly attached at its distal end to the inner collar, the inner surface of the inner collar and the outer surface of the proximal end of the cylinder section forming a cavity, the flip-cap optionally comprising a flange fixedly attached to the outer surface of the outer collar; (c) a slidably removable probe; and (d) a substantially hollow cap duckbill adapted to mate with the proximal end of the hollow cylinder section of the flip-cap and which forms a seal within the fitment that can be unsealed by insertion of the probe into the fitment through the hollow cylinder section of the flip-cap, the cap duckbill having a tapered end and an ejection end, the tapered end having a dome with a reversibly sealable slit capable of preventing fluid flow through the flip-cap upon removal of the probe from the fitment; characterized in that the outer surface of said inner collar comprises a first sealing ring having a flat surface, and a second sealing ring (42, 43) having a curved surface, wherein said sealing rings (42, 43, 44) protrude outwardly exerting a force on the inner wall of the spout to create said aseptic seal such that said flip-cap is an aseptic flip-cap. (a) a spout comprising a generally hollow cylindrical body having an external surface capable of mating with an aseptic flip-cap, the spout having at one end, a base portion for securing the spout to the collapsible bag; (b) a flip-cap having an outer collar and an inner collar with the outer collar and the inner collar each having an inner and outer surface, the inner surface of the outer collar and the outer surface of the inner collar forming a cavity adapted to be removably attachable to the spout creating an aseptic seal with an inner wall of the spout, the inner surface of the inner collar being capable of attaching to a cap duckbill, the flip-cap further comprising a hollow cylinder section comprising a proximal end and a distal end with each having an inner and outer surface, the hollow cylinder section being fixedly attached at its distal end to the inner collar, the inner surface of the inner collar and the outer surface of the proximal end of the cylinder section forming a cavity, the flip-cap optionally comprising a flange fixedly attached to the outer surface of the outer collar; (c) a slidably removable probe; and (d) a substantially hollow cap duckbill adapted to mate with the proximal end of the hollow cylinder section of the flip-cap and which forms a seal within the fitment that can be unsealed by insertion of the probe into the fitment through the hollow cylinder section of the flip-cap, the cap duckbill having a tapered end and an ejection end, the tapered end having a dome with a reversibly sealable slit capable of preventing fluid flow through the flip-cap upon removal of the probe from the fitment;