Grains are no problem in most countries but some ban the import of grapes and raisins unless they are certified disease-free ... so it depends which country you are taking that raisin bran into. It is definitely illegal in some countries and will be confiscated, but most are ok with it. Sealed or not makes no difference, nor does the original packaging (certification is required, or sometimes you can pay for fumigation upon arrival, but that is generally expensive and takes many days -- not relevant to bringing in food).