This is an improved variant of this compost bag holder.
https://www.printables.com/model/120150-compost-bag-holder

The spring function hold the bags against the wall so that they can not fall out by mistake.
I printed it in PETG, 5 Perimeters & 0% Infill. no support, only bridging.
I think you can reduce the perimeters & make it even more flexible.
Happy printing.