If you need the sound of a double bass and you do not want to carry one, the solution is this bass ukulele size (it only measures 77 cm in total length).
It is a new version of the bass Ashbory but with acoustic cover so that it sounds more like a wooden instrument. It also has a Shadow preamp with tuner and a special Shadow pickup for this bass.
The secret of the sound is in the polyurethane strings, which have no metal (like any acoustic bass string), they lack that metallic shine that makes the sound of imitation of double bass little credible.
A custom case is included.