This is a great cooker. Out side the tropics a straight panel cooker battles on all but the best days and this cooker takes advantage of lower sun angles in morning and afternoon. Being more efficient it makes up for the odd cloud in the day. It is stable in wind and if put together with paper fasteners can fold down flat for storage. Seasonal changes are made by adjusting the side flaps up or down. Paint the un-foiled sections of the cooker to guard against moisture.