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Other than some of what's already been mentioned, I also include a couple of the heavy binder clips such as those used on indoor target hangers, as well as a piece of corrugated cardboard. There has been an occasion where the range's clips have been "shot out" by the time I get there, or don't hold the target securly enough (even with multiple folds on the target corner) and a piece of cardboard comes in handy to give the clip a bit of extra grip.

On some trips I also include a little dustpan/brush for sweeping up brass (handy if you like to save your own brass), and I always like to include a couple extra ziploc baggies for who knows what you'll need them for.