A non-sterile device intended to be placed between a nebulizer or a metered dose inhaler (MDI) and the patient's mouth, to function as a reservoir into which an aerosol medication is dispensed in order to minimize delivery of large aerosolized particles. It is typically made of plastic, paper, or cardboard and in the form of a small tube-like container. By holding the drug(s) after aerosolization (e.g., via an internal valve) this device reduces the direct delivery of large aerosolized particles which would otherwise be deposited in the mouth/upper airway, but are intended for the lower airway. This is a single-use device.