A reservoir and a nebulizer having such a reservoir are proposed. The reservoir comprises a closure for a fluid chamber with a medicament formulation that is formed by two closure members welded together. The closure comprises a particle barrier for preventing the ingress into the fluid chamber of any weld particles that may potentially be formed during the welding of the two closure members. The fluid chamber is preferably broadened in the shape of a beaver tail and is sealed lengthways with an additional strip of material.
