For others, like me who'd never heard of them here's the link.........http://www.nb-wonderbag.com/Pages/ProductsA fundraising take on an old idea - the hay box cooker.Here's a modern/cheap take on making one of those........http://www.instructables.com/id/hay-box-cooker/We used to use hay boxes on Girl Guide camping trips, always something hot to come back to in the evening