Designed by Micah Evans and executed by the Grav Labs team, the Upline combines optimal functionality with jaw-dropping architectural elegance. The Upline collection by Grav Labs is one of the most popular bong collections anywhere. Uplines work by pulling the water through the spine of the Upline piece and filters the smoke in each individual chamber. What you get is an amazingly smooth, filtered, flavorful smoke with one fun percolating sound effect when drawing. Grav Labs is well-known for using laboratory-grade scientific glass that means durability and longevity and the Upline collection is no different. If you think the Upline bong is a little too intimating or too large for what you may need, there are other fantastic pieces in the collection that might just be what you are looking for. All pieces from the Upline collection, like the bubblers and smaller pipes, are crafted with the same care and still take advantage of the same marvelous Upline technology that we know and love. The Upline collection by Grav Labs is one of the most popular and well-known bong collections. Fit with their completely unique design, the Upline bongs, pipes, and ash catchers from Grav Labs are sure to impress all levels of smokers. Here at Billowby's online head shop, we are super proud to call the great people at Grav Labs our friends. To see a review of any of the Grav Labs items we carry, simply click on any one of our featured Grav Labs products.