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I have not used this bag as it was purchased for emergency use. The unit is much smaller than anticipated with a thin Mylar sleeping bag. The whistle a good add on feature and the bag would be very light to carry, making it mainly useful for an emergency situation. In fairness, I gave it a four star since I have not used it, but would compare more thoroughly with other bags if I was purchasing again.
This little item is PERFECT for having in your car for emergencies or for tossing in you day backpack. It has a high quality whistle Attached to the bag too. If you are prepping for an emergency this item is a must have.