My husband and I purchased two of your bags about 4 years ago. Living on a Narrowboat, we used them alot for shopping, and they are compact. With limited space, they are ideal. They have carried more weight than they should, and I have used mine alot. Only recently has the stitching worn away. We also have two of the larger holdall bags which we use if we go away for a week. It's surprising how much you can get in them, and they fold smaller than the backpacks.
To summarise, they are compact, strong, useful, and made out of plastic bottles, are eco friendly. Amazing bags, and I would recommend them to everyone. We would certainly buy them again.