Cold-weather camping is easy when you have a Big Bay -17°C (0°F) Mummy Sleeping Bag. From weekend camping trips to stargazing nights in the backyard, this sleeping bag's Coletherm MAX insulation will keep you warm in temps as low as -17°C (0°F). Tend to run cold? The semi-sculpted hood and Thermolock draft tube helps to lock in heat so you stay comfortable when the temps drop.