This Orikaso Picnic/Dinner Set is genius!  If you like to travel light, especially when camping or going on day hikes, this set is perfect for you.  The dishes are a flat heavy-duty plastic that you fold into dishes, cups, and bowls when you are ready to eat.  They are easy to assemble and won't leak. 

You can view a video on how easy it is to assemble the cup here.

[via Random Good Stuff]