If you were to put a tape measure around the tube/neck of the average sized straight bongs, what would it be? For example, I am interested in this because it appears to me that there are two average sizes of the tube for regular straight ice catching bongs. 6" and 7" using a tape measure. It makes sense because people's mouth's only get so big or small. This has been my experience with bongs 10" through 36." I am just interested to see if anyone gets different numbers than me.