I do have to disagree about one-time use; unless the wound is huge, often one can fold the top of the foil-pac over and reuse it. It doesn't take a huge glob to cover a typical finger-cut....
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein