Reusable Bags

Given my failed attempt to get the grocery store to be "green" on my behalf, I guess I need to start paying more attention to this on my own as a starting point. So, I've gathered up all of the reusable bags that I'd purchased here and there on a whim. I put one in the front seat and the other couple in the trunk. Now, the question becomes, will I use them? Would be nice if I had it in my purse instead, but they are too bulky for that, so I'll have to try to remember . . .