Blood pack

A blood pack is simply a pack of blood and, initially, is next to useless as a healing item as it only restores 1HP per pack.

It can often be found in searchable first aid kits, along with Stimpaks, Dirty Water, Purified Water, and Rad Away. First aid kits are commonly found in bathrooms on the interior wall next to the door.

After the player acquires the Hematophage perk, blood packs become much more useful, with one pack restoring 20HP with no radiation damage, making it just as useful as purified water (which is harder to find). You can earn this perk by talking to Vance after completion of Blood Ties.

They can also be traded to Vance and the Family in exchange for 15 Caps if he made a deal between the Family and the people of Arefu.