A lab container is a vessel used to store and transport materials in a laboratory setting. The most common lab containers are beakers, vials, phials, flasks, and test tubes. Beakers are cylindrical vessels with a flat bottom and a spout for pouring. Vials are small, cylindrical containers with a lid or stopper. Phials are similar to vials but have a wider opening. Flasks are shaped like a bottle with a narrow neck and a flat bottom. Test tubes are cylindrical tubes with a rounded bottom and an open top.