My husband and I agreed to buy our first reusable shopping bags at Walmart. I was surprised to find that they are actually very durable and have lots more room than your average plastic bag. In just one blue tote we were able to fit to large bags of Ruffles chips, bread, english muffins, and hot dog buns. And there was still plenty of room left for lots more!
We figure we use on average 8+ plastic grocery bags every time we go shopping for groceries (not even including basic toiletries or non-grocery shopping items). And if we go shopping on average 4 times a month that is 32 bags minimum a month and 384 in a year!
Now the trick is to keep them on hand so we can use them each time. We stored all 4 bags in the trunk of our van for when we go grocery shopping. I can't wait to use them the next time we go grocery shopping.