For its price (6~8€) it's okay, however it doesn't have good build quality, e.g. the zippers get stuck all the time and will probably come off at some point; it's not waterproof either (not that the manufacturer claims otherwise). It's good for someone who wants something small, lightweight, portable, and affordable.

Exactly as shown in the photo, it looks quite well-made, stands very well on the rack, and is very easy to install. The elastic band and the pocket on the top surface offer possibilities for extra items. The price was very low and it was impossible to pass up. Its waterproofness remains to be seen, although the entire interior is lined with plastic thermal insulation, so I don't think water will get in, even if the outer material is not fully waterproof. In any case, a small bag that one can always keep inside covers it perfectly in case of need.