It is amazing @anise! I find it works best for cooking pulses; beans, lentils etc, but important to keep the pot lid tightly sealed and immediately place it inside the wonderbag to retain the heat. It's insulated with repurposed foam chips, is fantastic as you don't have to watch it constantly when making soup or casseroles as the liquids do not evaporate, and a huge help for rural people who still don't have electricity! Also great for keeping food hot when going on picnics etc. One can order them online from various suppliers, my son ordered mine from yuppiechef.com. Thank you for stopping by :)