Amazon.com : Ironstripe Bivy Sack Emergency Sleeping Bag – Extra Large 94'' x 48'' Built-in Hood, Survival Sleeping Bag with Emergency Whistle, Thermal Mylar – Tear & Puncture-Resistant Emergency Bivy Bag :
Amazon.com : FosPower Emergency Sleeping Bag, Tough and Durable Mylar Thermal Sack with Survival Whistle for Survival Kits, Camping Accessories, Outdoors, Hiking : Sports & Outdoors