Hmm. I have a mylar blanket that I keep in my bike bag during cooler months, for emergencies. I looked for it recently, couldn't find it anywhere, not in any of the places where I keep bike gear. Bought another one yesterday. OF COURSE this means that I found the first one this morning. Fortunately they're inexpensive and having two is actually a good thing -- now there's one for the car and one for the bike!