|Dimensions||35 × 82 in|
Measuring roughly 3 feet by 6.5 feet, this mylar emergency sleep sack is waterproof, light, and retains up to 90% of your body heat. We tested one in mid-winter and were very pleased to find that it actually keeps you quite warm. This is bigger and much more effective than an emergency blanket, and if you think you might have to spend the night outside, go for this one. You can also increase warmth by including extra insulation – clothes, paper, leaves, etc.