ChicoBags - reusable cloth bag packs into tiny bundle

I've been keeping a ChicoBag in my travel kit for about ten years. It's small enough that I could almost hide it in my fist. But when opened, it's large enough to carry a laptop and charger, or a beach towel and sunscreen, or a fair amount of groceries. It's made of polyester and can carry a lot of weight without bursting at the seams. It has handles. I've used it countless times. The bag has a sewn on pouch, so you can stuff the bag into the pouch, ouroboros-style. A four-pack costs $20 on Amazon.