The customizable label has blood type A, B, AB, O and Other. Other category is a fill in box and can write in your own preferred blood type, for example, Vampire, Alien or Zombie... Keep from heat. Overheating and freezing may damage the blood bag and cause leakage. Do not squash or overfill the bag as this may cause tears in the blood bag. Do not fill with drinks over 113 F.