To Dulcet: I do my grocery shopping once a week as well. Remember, your cloth bags will hold more than the typical plastic bags. I have a fold-up bag that I carry with me at all times (it’s great - it’s made of parachute silk and I have been using it for 10 years and it still looks like new!), but that is not what I use for grocery shopping. I made what I call an uber-bag. It is a very, very heavy duty bag that can handle the heavy items like milk. The straps go all the way around the bottom for reinforcement and it is made out of very heavy canvas. On the outside I have four large pleated pockets that hold three additional canvas bags (regular ones not overly heavy duty) and six mesh bags for produce. All this handles my weekly shopping and I keep it by the front door. Don’t even try to carry around in your purse all the bags you’ll need for weekly grocery shopping. Good luck - it took me longer than I ever thought possible to get into the habit of bringing my own bags to the store, but I am so happy that the habit has been established!