Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sturdy, Light, and Funcional

I love the Topeak QuickTrack system. I have two bags of different sizes, one for commuting to work, and one for recreational trips. This rack, in conjuction with the bags, is a very sturdy and convient way to carry what I need for the day. I'm not sure this is the best rack for the money if you don't buy into the whole system, but buying into the whole system is exactly what I would recommend. It is not cheap, but the convience and security has made me a fan of Topeak products. I just bought a second rack to mount on my latest bike. Other than normal wear from years of use, my old rack is going strong.