This is an onigiri (rice ball) case with a built-in ice pack in the lid, designed to keep the lid chilled. It's sized to fit one convenience store onigiri. The hard case prevents the onigiri from being crushed, but it is a bit heavy. Available in three colors: white, pink, and gray. I bought three of these to give to my children, and used them a couple of times, but the weight became a concern when carrying them around, so I stopped using them. They have been stored at home. If you're interested, please take a look! Size: W103 x D95 x H66mm Material: ABS resin Capacity: Approximately 180ml Made in Japan Heat resistance/Cold resistance: 60°C / -20°C Weight: 127 grams