The bag feels well-made and sturdy. The straps don't feel like they will rip off or tear when lifting the bag with the cart in it. The wheels on the E5 are 19" across when the cart is collapsed, but the inside of the bag where the wheels are, is only 15" wide. When loading the cart into the bag, the wide wheels cause the bag to shift and collapse, making it difficult to get the cart in the bag. After it is in, it doesn't zip well because the side are pulled out of shape. And it still doesn't look like you put it in correctly.