Blizzard Survival Sleeping Bag (Bivvy) - Tactical / Reversible Triple Cell Survival Sleeping Bag Has Best Insulating Dynamics of Any Survival Bag (Bivvy) Tactical Olive Drab - Reversible to Silver for Emergency Signaling and High Visibility Military & Civilian Applications: Used by Special Operations Forces Worldwide. Warmth: 8 Togs - Equal to a Medium Weight Regular Sleeping Bag. Compact & Lightweight: 8.5 in. X 4 in. X 1.75 in. /13.3 ounces.