Whisk mayonnaise, orange zest, orange juice, soy sauce, sesame oil and vinegar and hot sauce together. Toss with chicken, celery, carrot, scallions, and spinach.

Arrange half of the filling on tortilla, nori, or Japanese omelet, close to you and being sure to leave a half-inch border. Roll away from you as tightly as possible, tucking the sides in as you roll. Slice into half-inch thick slices and store, seam side down in the bento box.