The product photo and the actual product are different.
The product is a bag for a top-action tuba, but the picture shown in the description is a bag for a front-action tuba.
The product description also requires a description that it is a bag for a top-action tuba.
I made the mistake of ordering incorrectly only by looking at the picture and explanation of the length of the bell size.
Of course, there are models that apply, but please add the description that it is a bag for a top-action tuba to make it easier to understand.
I gave up because it was too expensive to return it.
I was too hasty to blame Thomann.