When dropped, it has the same world model as a blood pack, but is weightless and much larger.
Unmarked quest: Blood BrotherhoodEdit
Collecting and selling these to Paladin Tristan is one of the easiest ways to earn money in the game, as super mutants are all over DC and can be collected even if the Lone Wanderer did not make the kill (if, for instance, a companion kills them). Additionally, the blood samples are weightless, and infinite amounts can be collected and sold altogether. Many samples can be collected during the Reilly's Rangers quest, due to the fact that most of the many enemies encountered during the quest will be super mutants.