There's no zip-lock bag or kit of anything sort. Normally they just hand out paper-thin slippers which come wrapped in plastic (non-zip-lock). They look somewhat similar to the slippers in business class (color-wise, vs. the red slippers in OZ F), but are much thinner. As D+, I'm often also handed eye shades and ear plugs separately by the cabin manager (same as what are given out in C), but those aren't given to other passengers that I've seen except on request. Although I have been on a handful of flights (not transpac red-eyes) where an FA went through the aisle passing out eye shades and ear plugs to those who wanted them.