I like to travel with a bag of rice cakes. I have checked with two brands, Koyo and Lundberg, about sesame cross-contamination.
Koyo's response: The rice cakes have no traces of egg. They do have sesame-flavored rice cakes. They clean the machine each time they change ingredients; however, since the plain rice cakes share the same machine with the sesame-flavored rice cakes, there are possibilities of cross-contamination.
Lundberg's response: They do not have eggs in any of their facilities. They do have sesame in their rice chips and rice cakes. They included an allergy sheet with detailed allergen information. They consider sesame, sulfites, and soon mustard, to be priority allergens in accordance with Canadian law (So fantastic!).
I am curious to hear from other sesame-allergic families their thoughts on the matter.