The author of an article about winter fishing with overnight stays in a car listed three items used for warmth. These are Nanga Aurora Light 600DX (about 50,000 yen) and Aurora 1000DX (about 55,000 yen) sleeping bags, a Bears Rock Kurumun inner sleeper (about 3,000 yen) and a Thermos Mountain Stainless Bottle of 900 ml. The sleeping bags are chosen by temperature: 600DX at 0 °C and above, 1000DX at lower temperatures. The inner sleeper is used as a blanket or mattress. The flask keeps water hot for up to 6 hours, enough to prepare instant noodles.
