Wide-mouth graduated hermetic containers for the storage and transport of histological samples, surgical specimens, or biological samples. Made of transparent, non-toxic polypropylene (PP). Equipped with a yellow HDPE screw cap that ensures a perfect seal and maximum safety. The bottom of the containers is grooved for a secure, non-slip grip. Compatible with formalin, which is commonly used to stabilize and preserve biological tissues. Additionally, the containers are compatible with a variety of other solvents and additives commonly used in histology, such as ethanol, liquid paraffin, and acetic acid.