Abstract: The sleeping bag is an insulated bag for covering and protecting the body of a user when the user is seated. The bag is formed from front and rear fabric sheets joined to one another and sized and shaped to receive the body of the user. At least one pair of slots is formed through the front fabric sheet to receive a seatbelt attached to a chair, such as an airplane seat, thus selectively securing both the user and the insulating bag to the seat. Alternatively, or in addition to the seatbelt slots, a pair of slots may be formed through the front fabric sheet for providing the user's hands free access to the external environment.