My problem is the opposite; I can't find a tamper small enough for some of my pipes. Luckily, there are usually enough twigs laying about.
(Nice shape on the pipe knife; I can't see a use for the second one though. A straight-backed blade cut down to a thin strip if the back seems more appropriate for a pick. Or a smaller reaming knife. Maybe weld a foot on that blade to make a tamper while it's still folded? High carbon steel, I'd guess, so the weld mght be difficult.)