Bubbler glass pipes are a popular form of hand pipe that introduces water filtration for a smoother, cleaner, and cooler smoking experience. Considered a hybrid of sorts, it offers convenience and portability while combining the benefits of a water pipe. A distinguishing characteristic is a fixed glass down-steam, which diffuses and filters the smoke through small holes or percolators. Water pipes often have detachable bowls and down-stems, whereas bubblers are all-in-one designs. Bubblers are often seen as conveniently sized and often more affordable options relative to larger bongs or other water pipes.