A package for reinforcing fibers to be used in production of fiber concrete or similar materials. The package has a continuous, elongated design with a circular, elliptical, square, rectangular or polygonal cross section. The fibers are longitudinally or transversally or randomly oriented and are filled into the package, wherein the fibers are uniformly arranged so that each length unit of the package has a defined amount of fibers. The continuous package is arranged into a transport box to be delivered to a concrete plant. The continuous package is fed to a conveyer belt, an aggregate belt, a skip, a weigh hopper, a truckmixer, or a premixer, wherein the package is opened and the fibers are dosed into the concrete.