According to a post on their official FB, Yamazaki Lunch Pack is exhibiting at “Tokyo Marathon Expo 2019” from 28 Feb to 2 March 2019. They are selling lunch pack sets and Tokyo-exclusive assortment of “Choi Paku” (bite-size rusk) at the booth.
Seems like you will receive a Kento clearfile if you purchase a rusk set ↓
They even have Kento “Recommended!” stickers on some of the lunch packs =D
