Single-use plastic sample vessels specifically designed for variable pathlength measurements. These disposable sample vessels support UV-Vis measurements for wavelengths between 220 nm and 800 nm and pathlengths up to 5 mm. Packaged and sold in convenient plastic trays, these single-use disposables help streamline the flow of samples across the SoloVPE system allowing analysts to get accurate results quickly with minimal effort and little or no clean-up.