I absolutely love this bag!! I have had this bag for about 2 months. I carry my food, supplements, shaker bottles, protein bars and snacks all in one bag. This bag has braved a 5 hour road trip, hours sitting under my desk, and several times sitting in a hot car for hours in the heat. The main compartment stays nice and cool. If you do leave the bag in a hot vehicle, I would recommend adding an ice pack to the main compartment and to the side compartments to help keep everything cool longer. The construction of the bag has held up well, with no fraying, tears, etc.