Coleman Big Bay 0/20/40°F Cold-Weather Mummy Sleeping Bag with Headrest

All-Season Warmth for Cold Nights

The Coleman Big Bay sleeping bag is designed for chilly conditions, delivering dependable warmth with Coletherm MAX insulation. With a temperature rating that accommodates temperatures as low as 0°F, this mummy-style bag helps you rest more comfortably during extended camping trips, late-season hikes, or backyard star-gazing sessions. The semi-sculpted hood works in concert with a thermally efficient build to help retain heat where it matters most, so you can focus on the moment rather than the forecast.

What makes it warm and comfortable

• Coletherm MAX insulation provides superior heat retention in very cold conditions, helping you stay warmer as night cools.
• The semi-sculpted hood is designed to trap heat close to the head and shoulders for enhanced insulation.
• A Thermolock draft tube along the zipper reduces heat loss at the entry point, helping maintain a steadier microclimate inside the bag.

Practical design features for real-life camping

• Foot ventilation is possible with a J-zipper, letting you air out the footbox on milder evenings without leaving your sleeping bag.
• The ZipPlow patented zipper design minimizes snags, making it easier to open and close the bag quickly, even with a cold hand.
• A compressible stuff sack helps you pack up and stow the bag for travel or storage without fuss.

Versatile use and size options

Whether you’re weekend camping, a backyard campout under the stars, or a temporary shelter during colder trips, this Big Bay bag is built to adapt to your needs. It is offered with Big & Tall options to accommodate a wider range of body types, ensuring that outdoor nights stay comfortable without feeling cramped. The combination of warmth, a thoughtful hood design, and practical packing features supports a relaxed, ready-for-anything camping routine.

Care, packing, and ongoing use

In addition to keeping you warm, the bag’s compressible storage sack and durable construction make it convenient for frequent use. The material choices and layout are aimed at providing a reliable home away from home, whether you’re setting up near a lake, in a forested clearing, or simply enjoying a night under the open sky during a chilly season.