System and method for filling of containers of collapsible type

A system for filling a package of the collapsible type with a product in the form of a powder or liquid, said system comprising:

• a package of the collapsible type, which has a chamber defined by flexible walls, and
• an arrangement for filling said package with a product in the form of a powder or liquid, which arrangement comprises
• a filling tube with an end portion which is made of a stiff material and which has an outer circumference (C2) and which, in order to transfer said product to the chamber, is insertable into a filling channel of the package which filling channel has an inner circumference (C1), and
• a clamping element which is designed to grip the end portion and the filling channel when said end portion is inserted into said filling channel when said end portion is inserted into said filling channel, so as to create a seal between the end portion and the filling channel,
• wherein the difference between the inner circumference (C1) of the filling channel and the outer circumference (C2) of the end portion is less than or equal to four times a wall thickness of the package walls, such that the ability of the filling channel to form folds when gripped by means of the clamping element is eliminated.