Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great bag but beware of heat

This bag is very well designed - it is perfect for the gym locker, with handy compartments and the ventilated top. However, my huge running shoes barely fit in the shoe area (women's size 12.5, men's size 10.5)The only other negative is the frame of my bag warped when left in my hot car all day. I decided to go ahead and replace it for the winter because it is that great a bag, but need to come up with a solution for next summer.