OSK Onigiri Lunch Case (Large) Onigiri LS-16 White 625ml I've only used it twice, but the lid clasp has become loose, so I think a rubber band is necessary. Other than that, there are no problems. I'll sell it at a low price! OSK Bento Box Onigiri Lunch Case An onigiri case that allows you to make onigiri without squeezing them, and also fits side dishes. Easy and time-saving onigiri lunch. Each onigiri made is about twice the size of a convenience store onigiri. You can have a flexible combination, such as one onigiri and side dishes today, or two onigiri today. Antibacterial agent added. The antibacterial power of silver ions inhibits the growth of bacteria on the resin surface.