
I am sorry if this is a sooo noob question, but I don t know how to make proper measurement of my tuba in order to fill the chart of the Cronhite gig bags, please help me

This is my horn


The problem is that I dont understand (probably because of the problem of propper translation) if I must make the measurements like this...

or like this...

In other words, I dont know if I must measure the flat area occupied by the tuba or the volume of It.
I noticed that in any part of the chart is asked a "side" measurement( or maybe I ve just missed it, if so please tell me


This is the chart, I m sure most of you know It UPDATED

Please I will apreciate any help, comment or anything you say to me about this.

