Abstract: Various exemplary methods, systems, and devices for vial holders are provided. The vial holders are assembled from housing components with a two-step snap closure, where a first step partially assembles the vial holders into a stable first configuration to form vial slots and shelf platforms for ease of receiving vials. The vial holders are advantageous for holding and labeling vials containing temperature sensitive therapeutic formulations that need to be handled under conditions limited by time and dexterity by permitting partial pre-assembly and labeling at a remote location and facilitating final assembly with minimal effort. In some embodiments, the vial holders incorporate tamper resistant structures that physically shield the two-step snap closure from external access.