Paper or plastic or reusable?

I have had several reusable bags that I have accumulated over the last several months, but always forget to use them. Last night I remembered, when I went to Walmart. I was really encouraged by this, because one bag held A LOT more than the plastic bags. I was able to carry my groceries to the car without the basket. Now for the sake of argument, I do reuse my plastic bags. I use them for every garbage can in my house. My daughter uses them for her lunch. So I do need a few plastic bags, but I plan to use my reusable bags more often.