Reagent vials designed to allow the use of a user-defined reagent on Dako Omnis. Each single-use bottle is labeled with positive identification technology. User-fillable reagent vial may be filled to a maximum fill volume of approximately 2 mL/30 mL, respectively. The vial closure contains a septum to reduce evaporation of reagent during onboard use in Dako Omnis reagent storage.