Zojirushi Stainless Steel Lunch Jar O-Be-N-To SL-GF18-BA Black Zojirushi Mahobin I didn't use it for long, only about 5 times. Large capacity, enough for 3 servings of rice. Keeps food warm until lunchtime, which is great for the cold season. In the hot summer months, it helps prevent food spoilage. Fully washable. Microwave safe.