I have signed up Cryolife for the cord blood storage. I have an option to choose either bags or vials(tube) to store the blood. Both have advantage or downside. For bags, the chance of getting contaminated of blood is lower but it is one-off for use. For vials, it comes in a 5 vials but contamination is higher when the blood is transferred to vials. Could anyone tell me what should I choose? I will have my expected delivery next Tues.