I guess that it depends on whether you want to hang it from something or set it on a shelf.
I am sure there are far more places to hang something, compared to setting, but if you have a camper, you can set it on top.
I found this for $38:
https://www.usplastic.com/catalog/it...E-NDkQDCw4I0Yg
Or you could add a spigot to a $5 black bucket.
I am sure that people would prefer to roll up a solar shower when not in use, but if you allow this to dry after use, you can store your sleeping bag and stuff inside.