These are the last of the ones I have so far from eroprofile. I used the keywords in category piss cup, glass, bottle, bowl, mug, pot, bucket (etc.) basically anything where you can see what the amount is.
http://www.eroprofile.com/m/videos/v...teur-Sex-Video
http://www.eroprofile.com/m/videos/v...teur-Sex-Video
Two girls pissing in bottles. Not very big bottles, but filling them easily and seemingly having to stop when the bottles are full even they though have more.