I feel a little bit guilty every time I get home from the grocery store and empty my pile plastic grocery bags and add them to my stash. I do reuse those bags for other things, but I have a lot of them and I don't need them all. I started out recently by asking for no bags for things I can carry--like if I am only getting a few items at a store or with gallons of milk. A few weeks ago one of my SIL showed me this tutorial that was perfect for me and my many extra bags issue. :) ---Reusable shopping totes made from sheets. I didn't follow the tutorial all the way, but used it as a guide.
I didn't have any old sheets lying around so when I was at the thrift center I browsed the linen section and found a flat sheet that I fell in love with! I don't know the size, but it is bigger than a twin so I think that I can get 3 or 4 bags from one sheet.
I threw a book and a few stamps sets in to show how roomy it is. If you click to enlarge, please ignore all the threads hanging--I was so excited to take pictures I didn't stop to cut them all first! 
I realized how useful it is when I threw a bunch of envelopes in it to go mail them at the post office and I decided it makes a nice regular tote too. :)
Click here to see where I linked.
