A system for (1) for filling of big bags (4) of various heights with material and a method for adjusting thereof, wherein a big bag (4) is to be placed with its filling spout (3) around an outer pipe (6) and the bottom (2) of the big bag (4) rests on an underlying surface (7). The outer pipe (6) is telescopically engaged to a feed pipe (5). The feed pipe (5) is in sections extendible. The feed pipe (5) is designed to fill a determined quantity of material in a vertical stream from an overlying dosage unit (8) via the outer pipe (6) and down into the big bag (4). The feed pipe (5) at its upper connection (5.3) includes at least one radial continuous interface surface design to attach to another feed pipe's (5.2) downward facing rim (5.6) or to the underside of the dosage unit (8.2).