[Paddlewise] First Aid kits

I could probably spend some time in a couple stores and figure this out
myself, but what the heck...it's easier to just ask!
I've seen several lists from Paddlewisers or other lists that discuss items
that should be carried in a first aid kit.  Is it better/cheaper to put the
kit together yourself by buying individual items, or should I go get a
preassembled kit, use that as the basis, and modify it by removing things
and adding things?

Rick 
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