Stay warm and comfortable during cold-weather camping trips with the BISINNA Ultralight Waterproof Camping Sleeping Bag. Designed for winter use, this envelope-style sleeping bag features durable 190T tear-resistant polyester fabric and a waterproof shell that helps block out moisture and wind. The interior is lined with soft polyester pongee and filled with insulating hollow cotton for optimal warmth. Available in multiple sizes and weights, it accommodates different body types and seasonal needs. The bottom zipper adds ventilation, and two bags can be zipped together to form a double sleeping bag, making it a flexible option for solo or paired camping.