Use a bento box to shape these into perfect rectangles!!! You can make various types of sandwiches. Enjoy many different flavors and store in the freezer.
Making onigiri rice balls every single morning takes so much time, so I always just sprinkle furikake seasoning. Then I thought I'd stock some in the freezer, since I store frozen rice anyway.
If you match the size of the sandwiches to the size of your bento box, after you cut them you can store them just like that.
Enjoy Japanese food around the world.