A method for manufacturing a number of tubular packagings filled with a liquid, particularly a sterile liquid. The method includes providing a tube which is wound onto a first reel and is filled at least partially with the liquid, and unwinding the tube from the first reel and dividing it into a number of tubular segments by means of successive welding operations. The tube is displaceable through a welding device substantially vertically and substantially free of mechanical tension. A temperature prevailing in the welding device can be kept constant during each welding operation by having liquid circulate through the welding device. One or more welding parameters can further be recorded during each welding operation and be stored together with data about the liquid. A system for performing this method.