It's not a necessity, but it's definitely convenient. I found a product called "Shopping Easy Grip" at Daiso, so I would like to introduce it.
"Shopping Easy Grip" is a silicone grip that prevents your hands from getting hurt when you hold a heavy plastic shopping bag. There is a cut at the top to allow the handle of the bag to pass through.
When I actually used it, the weight on my fingers was certainly reduced, and the soft feel of the silicone made it feel very easy. If you attach it to your work bag using the attached chain, you can use it whenever you need it. If you have the experience that a heavy plastic shopping bag digs into your finger on your way home from the supermarket, why not try it? The price is, of course, 108 yen per piece (tax included).