The best ones to carry large light weight bulky stuff are the blue 59c ones from Ikea! For heavy items, the canvas LLBean ones are great and last decades (got one in just about every size, my oldest one is 30 years old and is the navy with red handles in my photo).
And if you are wondering, yes, I always bag my own groceries and most everything else as well. I've got just the bag(s) for my purchases to fit just right!
BSoleille! The bright side of a bag for every occasion!