Aldi's makes you buy whatever bag you are going to use or you can opt to use whatever cardboard box they put out in the area designated to bag your groceries. I guess that would be rather messy though for bigger retailers. I reuse all the plastic bags I bring home, it's just me and recycling also cuts down on the amount of trash so I put all my trash in them instead of buying trash bags. Our city incinerates our trash also so it doesn't go into a landfill.
I am still planning my Trump blog, I got it about half done but was gone helping a friend for a couple days and the mood to finish it hasn't struck since I've been back home.