Samples Containers Are Air Tight, Leakproof, Tamperproof. Samples Containers Are Made From Pharma grade Virgin Plastic. Samples Containers Are Round Or Cylindrical In Shape With White Air Tight Screw Caps to prevent leakage and overflow, and the bottom of the cup is flat, so it can be placed easily. These urine containers are marked with printed graduation on the bottle( measurements on the bottle are present) These Are Also Used As Urine Container, Lab Samples Container, Sputum Container, Stool Sample Container