Abstract: The disposable set includes an infusion device having an outflow conduit and a needle. The packager is defined by a single bag made of transparent, flexible, plastic material and having a first compartment enclosing the medicinal fluid, and a second compartment enclosing the infusion device. The two compartments are formed from two sheets of the aforementioned material, heat sealed along the outer edges of the sheets, so as to be sealed with respect to the outside environment, and the compartments are also separated in airtight manner from each other by another seal. The conduit communicates with the first compartment via a chamber formed by a further seal and acting as a drip for visually controlling the infusion treatment.