Micro-Polyvials have been developed for storage and packaging low volumes of reagents. They are made of high purity, virginal polypropylene. Closure ensures tight sealing without the use of septa or liners. Slight conically shaped bottoms facilitate sample recovery. They are easy to open and close due to their large shoulders and the ergonomic structure of their caps. Caps are available in white and in colors to aid in sample identification.