Look for thick glass: Thicker glass is generally a sign of a well-made bong that is less likely to break or crack. Check for smooth edges: Sharp edges or rough spots can indicate poor craftsmanship and may make the bong uncomfortable to use. Check the weight: A heavier bong often means it's made with high-quality materials and is less likely to tip over. Consider the brand: Some brands are known for producing high-quality bongs that are both durable and effective. It's worth doing some research to find out which brands are most highly regarded in the industry.