This is a very simple and non fancy handle for textile shopping bags. I recently had to carry two heavy bags around and it wasn't fun. The textile handles rolled into a thin pipe like handle and pulled into my hands.

I looked as available handled, but they were too fancy and over engineered, designed for plastic bags or to small for bigger hands.

So I did a quick and dirty design in FreeCAD to get a proper handle for my needs. I printed from ABS to give it a little flex and the design is big enough to withstand a lot abuse before breaking. It is suitable for at least two bags at once. If your hands are big enough you automatically seal the opening at the handle, so the strings do not get out.

I probably will update this design if it needs an improvement. Initial tests looks fine.

As always I included the FreeCAD parametric source file, so you can change the sizes and shape to your personal need.

I printed in ABS, so I can leave the handle in the glove compartment of my car without the risk of melting it in the summer.

PLA should work if you avoid keeping the handle in your car for a long period of time.