Quick tip before I head off into the kitchen to cook potatoes forever:
We live on the third floor of our apartment building. All of those stairs can get old fast, especially when you have a bunch of heavy groceries to take up. If I put bag handles on my arms, they cut into them and also make it difficult to walk.
My solution: I keep a very sturdy laundry basket in my trunk when I go to the grocery. I put the bags in the basket, and carry it upstairs that way.