We use ziploc bags that have a large red stripe for blood products that go via pneumatic tube system to patient floors. They have the red stripe on them because nurses complained they could not tell if a tube held a blood product in it when glancing at the tube when it falls on their station. Therefore if they see the red stripe they are more likely to go empty the tube sooner knowing a blood product could be in it. We also use a Ziploc bag with a yellow label stating "PLATELET DO NOT PUT IN COOLER" when issuing platelets to the OR. You'd be surprised at how many platelets we still get back from the OR in the cooler even with this label on the bag!