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That's a lot of vomit for just one bulemic. Unless he/she is somehow saving it up over several days before dumping it -- but I would think the noxious smell of a vomit-filled container hiding in a closet or bathroom would probably alert the family/roommates.
Did you ever see that Afterschool Special about bulimia with Calista Flockhart? I remember being really freaked out when they showed all the bags and jars of vomit she had hidden all over her room.