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: MEKKAPRO SOS Emergency Thermal Bivy Sleeping Bag with Survival Whistle, Survival Bivvy Sack, Mylar Emergency Blanket : Sports & Outdoors