The basic design goes back to the 1950s. There's hundreds of variations from a myriad of manufacturers, asking for a specific brand name is like asking for the brand name of rubber ducks or something equally generic and widely produced.

First time getting these, there was for sure a fleeting moment of childlike wonder, like it is kinda neat. Soy for sushi in the shape of a fish. Clever.

Then again, microplastic from these containers will end up in the oceans and inside the very fish being used to make sushi - it's all very cyclical and tragic and there's nothing cute or convenient about it in the long run.

Not only are these widely available across the world, they're iconic. Been around since the 50s.