Onigiri is a triangle shaped sushi wrapped in Japanese seaweed. Onigiri is my favourite food to pack for work lunch, road trips and picnic. You can actually make onigiri a day in advance and just pack them in your bento lunch.
Gimbap is a korean style sushi roll where gim means seaweed and bap means rice. It is very different from the Japanese sushi because Gimbap uses only sesame oil and salt to season its rice while Japanese sushi uses sugar, salt and vingar.