A cousin of mine is a mountaineer, and he asked me if I can give him something useful during camping. I was thinking of giving him a butane burner, but it might not be safe especially if they're hiking and assuming it would be sunny, there might be a tendency that the butane can will blow up. So, I looked up for another item that would be very useful and handy. I came across the sleeping bags, but this bivy sack catches my attention the most. They are too small, and I don't think he will like it, but I bought it anyway. I was giggling when I gave it to him. He was curious and when he opened it he was amazed. He said it is very convenient and it will reduce the weight of the bag that he'll carry. The whistle is pretty loud too which is good, in case of an emergency. I hope there would be a variety of colors for us to pick. Nevertheless, it works perfectly.