Like your blood. (warning, this topic may make some people feel a little wooooooozy)
Think about it in abstract and it's a bit bizarre to consider your blood going into a bag. Deliberately.
I got a letter from the Scottish Blood Donor Service saying thanks for donating in 2009. This was more than just a few lines and a "thank you", but included four stories of real people whose lives were changed - or even saved - thanks in part to the blood they received. It's always more personal when there's a real story being told.
I carried this letter in my bag for a few days to remind me that I need to go and give blood again soon. Why? because I'm not just putting blood in a bag, but I'm putting blood in a person.
And that's a very encouraging thought.
You can read the stories and get involved at www.scotblood.co.uk