Super mutant blood sample
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 probably the easiest way 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), and as the blood samples are weightless infinite amounts can be collected and sold altogether. If Reilly's Rangers quest has not yet been completed by the time many samples of these can be collected during the quest.