I just bought the ones they were selling at my local grocery store since they were only $0.99, and because the store gave a $0.05 per bag each time you used them. I bought 4 bags, and typically use about 2-3 on a weekly shopping trip for DH and myself. They really can hold much more than the flimsy plastic bags. Even though they were very cheap, they seem to be holding up well. I've been using them for almost 2 years.