A collection of devices intended to be used by a layperson in the home to self-collect and mail a saliva/oral, nasal, nasopharyngeal, and/or oropharyngeal specimen to a clinical laboratory for in vitro diagnostic investigation (e.g., COVID-19 testing); it may in addition be used in a clinical setting by a healthcare professional. It consists of a non-suctioning specimen sampling/collection tool(s) [e.g., swab, brush, saliva collection mouthpiece/funnel], a covered specimen receptacle with or without an additive/medium [e.g., preservative solution, microbiological medium (e.g., Amies, Stuart, viral transport/inactivation medium)], and mailing packing/envelope. This is a single-use device.