Abstract: A flexible enclosure structure which may be placed on a vehicle so that its bottom and two sides are anchored within the vehicle's interior. The top panel is fastened to the roof, preferably in a manner which results in a low air flow impedance. With the internal anchoring and the low air flow impedance to the structure along the outer surfaces of the vehicle, the vehicle may be driven on roadways for short errands while the structure is in place. When desired, the enclosure structure may be removed from the vehicle and folded, because of its flexibility, into a small, conveniently carried package. The structure includes windows to permit the entry of light and entry and exit flaps which may be closed during inclement weather. When the flaps are open, screening inhibits the entry of insects. When camping of more than a transient moment is anticipated, a tent enclosure may be coupled to the vehicle mounted enclosure.