Robust is not always a plus

Yes, these bags are definitely robust. Unfortunately this is not the only criterion of importance for a sub-bouncer. With the diversification of these devices bags / tube rolls should be specified in terms of:

Type of polyethylene: low / high density

Film thickness: normally 30 microns -> 200 microns

Smooth / corrugated

I spent hours searching but I did not get to find ones I want for my machine: High density; 50 microns; smooth. I thought they would be enough but they are too thick and welding does quen seffectue two / three steps and sometimes, not at all.

So if you have a sub-draining equal to bags, go for it. They are super strong. If you have a small sub-machine for emptying your garden produce in season, tell me if you find the above film!