We found this in leaf duff on the ground, under the edge of the canopy of an oak near a pond on private acreage. We had not seen anything like this before; it has something loose inside, feels like thin, sturdy styrofoam (but looks woven up close). It seems to have what look like seams, and has leaf impressions and partial leaves wrapped around it. Since other things around (like mushrooms in the ground) were dessicated, we thought this was not live. I cut along one edge to see what was inside, and there is a brown pupa which turned out to be live;a friend saw it move. There is air space inside and no apparent soft silk. I've since placed the whole thing in a container with partially damp substrate to await what happens. The pupa itself seems to be at least 3cm.