a stap around DB ?

[kennettsq]

I would like to know why sometimes there is a strap or band around the bass? between the upper and lower bouts.

 

[charlespf]

that's a bib.
there are a few threads answering this same question.

 

[Lynn Seaton]

This is new to me. There is a pickup that wraps around the bass. Either it is a bib as mentioned above, or this new pickup. https://www.thomann.de/gb/headway_the_band_double_bass_pickup.htm