I live in the desert. I keep my bags in the car, ready for any shopping spree (otherwise I'd forget them). It can get up to 150 degrees in my garage in the summer - I know that because I installed a thermometer there. These bags are made from heat resistant polypropylene which is why I bought them. My bags literally crumbled to dust and partially melted in my car. Note that I haven't spent the summer with these bags yet, but I love them. (EDIT: These bags survived 3 months of sweltering heat in my car with no issues; they continue to be very durable). They have proven to be strong, stay flat underneath when standing up and are very cute, especially birds.
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