I purchased this to use at the gym! My drawstring bags were too flimsy and hard to carry, and my other gym bags were too bulky. So I love the foldable backpack -- it has great pockets and even water bottle holders on the side and it holds a surprising amount of stuff. I can fit two pairs of shoes, a change of clothes, and toiletries in here and still have space to spare. I also sometimes take it grocery shopping since it's impact and fits a ton and the straps are padded so it's easy to carry a lot.
Full disclosure: I'm an employee of Brandless, Inc., and purchased this product with my own money. I chose to post a review on my own accord and without any additional compensation, monetary or otherwise.