When I go shopping I ALWAYS take my re-usable shopping bags. ...But, sometimes I forget :( Not to fear! Regular plastic shopping bags make great trash bin liners for the bathroom or other small trash cans. The smallest shopping bags are great for pet waste. The giant shopping bags fit in my kitchen garbage bin (which is less than half the size of my kitchen recycling bin).
Don't just throw those bags away! Throw all your trash away in them! :D
There are so many great things I've seen made out of plastic bags, including reusable shopping bags! My favorite reused plastic bag project is still crocheted hammocks!!